Machin series

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The Machin series is the principal set of definitive postage stamps issued in the United Kingdom during the reign of Queen Elizabeth II. First released on 5 June 1967 by the General Post Office (GPO), the stamp features a stark, low-relief profile of the monarch sculpted by artist Arnold Machin. With only the Queen's effigy and a clean numeral indicating the denomination against a solid background, the design served as the everyday workhorse of British correspondence for over five decades.

Beyond its status as an icon of twentieth-century graphic design, the Machin series is celebrated by postal workers and engineers as a triumph of industrial ergonomics. Its water-activated gum, crisp perforations, and ultraviolet phosphor bands allowed the stamp to lie completely flat on envelopes and trigger high-speed optical sorting sensors without jamming. In recent decades, the series has also gained prominence in comparative chronistics after signals from The Eternal Broadcast revealed that the parallel timeline known as the Other Side issued an identical portrait in 1967, making the Machin profile one of the latest artistic works shared across both worlds.

Origins and the 1965 Stamp Advisory Committee Dispute

From 1952 until the mid-1960s, ordinary British postage stamps relied on the Wilding series, which surrounded a studio photograph of the Queen by Dorothy Wilding with ornate heraldic borders of Tudor roses, thistles, shamrocks, and daffodils. While traditionalists admired the floral frames, the cluttered design left little room for modern typography and struggled to accommodate the phosphor-ink coding bands required by the GPO's first generation of electro-mechanical sorting machines.

In 1964, recently appointed Postmaster General Tony Benn launched a contentious campaign to modernize British stamp design. Working alongside graphic designer David Gentleman, Benn proposed replacing the monarch's head entirely on commemorative and definitive issues with national symbols, industrial achievements, and the letters "UK" or "Great Britain." The proposal sparked the 1965 Stamp Advisory Committee Dispute, a fierce fifteen-month standoff pitting Benn and progressive designers against Buckingham Palace, Conservative parliamentarians, and senior officials on the Stamp Advisory Committee. Critics accused the Postmaster General of creeping republicanism, while GPO engineers warned that variable pictorial designs would confuse automated facing sensors.

A compromise was reached in early 1965: the Queen's effigy would remain mandatory on all definitive stamps, but the cluttered heraldic borders would be stripped away in favour of a single classical bas-relief portrait that could serve as both national identifier and functional symbol. The committee invited five artists, including Gentleman and sculptor Arnold Machin—who had already designed the portrait for Britain's upcoming decimal coinage—to submit prototypes.

Sculpting and production

Machin worked for fourteen months at his studio in Staffordshire and the Royal Mint, producing four distinct plaster and terracotta reliefs before arriving at the final design. Working from sittings with the Queen and photographs taken by Lord Snowdon, he replaced the traditional St Edward's Crown with the lighter Diamond Diadem worn at the 1953 coronation. In late 1965, a debate broke out within the committee over the neckline: palace courtiers favoured a classical "cut-off" bust floating above the bottom edge, whereas printers at Harrison and Sons argued that a corsage extending to the base of the stamp anchored the portrait visually. The Queen personally approved the corsage version in March 1966.

Arnold Machin's plaster working cast and Harrison and Sons colour trial proofs from 1966.

Translating the plaster sculpture into a miniature two-dimensional stamp required meticulous lighting. Photographer John Hedgecoe illuminated the eighteen-inch plaster cast against a black velvet backdrop using two cross-angled lamps, creating deep tonal gradations across the cheek and diadem. Harrison and Sons engraved the resulting photograph onto copper cylinders for photogravure printing, pairing the pale portrait with gill-sans numerals in the lower left corner.

Rollout, public reaction, and the "sweet gum" shift

The Machin series debuted on 5 June 1967 with three pre-decimal values: the fourpence (4d) in olive-sepia, the one-shilling (1/-) in light violet, and the one-shilling-and-ninepence (1/9) in orange and black. Sixteen additional values followed over the next two years, culminating in the complete decimal transition on Decimal Day (15 February 1971), which introduced the familiar half-penny turquoise and three-pence ultramarine stamps.

Public reaction in the summer of 1967 was immediate and overwhelmingly favourable. Design critics praised the stamps' calm minimalism, while everyday letter-writers welcomed the legibility of the bold corner numerals compared to the cramped lettering of the Wilding era. However, the most talked-about feature among the British public was the taste of the adhesive.

For over a century, British stamps had been coated with gum arabic harvested from Sudan, a resin that tasted distinctly bitter and sticky on the tongue. Coinciding with the 1967–1968 Machin rollout, Harrison and Sons introduced synthetic polyvinyl alcohol (PVA) water-activated gum blended with dextrin. Smooth, odourless, and faintly sweet with a mild peppermint or wintergreen finish on early decimal printings, the new adhesive became a minor cultural sensation. Newspaper columnists joked that children were volunteering to post the family Christmas cards just to lick the fourpence sepia stamps, while post office clerks appreciated that PVA sheets did not curl or weld themselves into solid bricks during damp autumn weather.

Sorting floor performance

While the public admired the portrait, postal workers judged the Machin series by its mechanical reliability. Following the reorganization of the postal service under the Post Office Act 1969, sorting depots across the country—such as the Westgate Sorting Office in Rotherham and later the automated Sheffield Mail Centre—came to regard the gummed Machin definitive as the gold standard of physical mail.

On automated lines such as the Integrated Mail Processor (IMP), stamps must survive high-speed rollers travelling at twelve metres per second while presenting a clean target for ultraviolet scanners. Machin stamps excelled on the sorting floor for three reasons:

  • Phosphor Band Clarity: Unlike busy pictorial commemoratives where printed colours interfered with chemical coatings, the single-colour background of a Machin stamp allowed two sharp vertical phosphor bands (for first class) or a single central band (for second class) to glow brightly under ultraviolet lamps, ensuring the facer-canceller flipped the envelope the right way up on the first pass.
  • Paper Fibres and PVA Gum: Water-activated PVA gum penetrated the paper fibres of standard DL envelopes, drying completely flat. When Royal Mail later introduced self-adhesive stamp booklets in the late 1990s, veteran sorters complained that pressure-sensitive glue bled out around the edges in warm pillar boxes, sticking letters together and fouling the steel culling drums.
  • Perforation Tear: Printed with a standard gauge of 15×1415 \times 14 perforations per two centimetres—and packed with an elliptical security cut along the lower thirds after 1993—Machin stamps separated cleanly at the counter without leaving ragged paper tags that could catch on wooden pigeonhole frames.

In his 2025 memoir Second Post: A Life Off-Key, retired Rotherham postman Arthur Pendelton noted that Westgate sorters routinely judged a customer's civic character by their choice of postage, remarking that a crisp DL envelope bearing a licked, straight-set Machin stamp was "a handshake between the citizen and the sorting frame."

Technical comparison of British definitive stamp eras on automated sorting lines
Stamp series / formatPrimary years of issueAdhesive and phosphor systemSorting floor assessment
Wilding series1952–1967Gum arabic; early graphite lines or broad phosphor bandsCluttered borders reduced contrast; gum curled in humid depots
Machin series (Gummed)1967–2022Water-activated PVA/dextrin; sharp vertical UV phosphor bandsUniversal benchmark; lies flat, zero glue bleed, 99.8% optical read rate
Machin series (Self-adhesive)1993–2022Pressure-sensitive acrylic; overprinted phosphor coatingDisliked by sorters; edge-bleed in summer causes double-feeds on IMP tracks
Pictorial Commemoratives1965–presentMixed PVA and self-adhesive; all-over phosphor washOversized dimensions and dark inks frequently confuse facing sensors

Comparative chronistics and the "Mirror Machins"

Because the design was finalized in 1966—only four years after the historical split described by the 1962 Divergence Theory—the Machin series occupies a unique place in the study of the Other Side. When television broadcasts from the alternate 1967 arrived via the Heaviside Mirror in June 2017, viewers watching the BBC's coverage of the Charing Cross Post Office launch saw Postmaster General Tony Benn unveil the exact same Arnold Machin bas-relief on the exact same day.

As the 1970s broadcasts arrived during the 2020s, philatelists and industrial historians writing for journals such as Sheffield's Canklow Road closely tracked how the parallel series evolved. While terrestrial Britain abolished the General Post Office in 1969 and gradually replaced numeric values with "1st" and "2nd" Non-Value Indicators (NVIs) to cope with frequent inflation, the Other Side retained the GPO as a public ministry and maintained stable decimal postage rates throughout the decade.

On television feeds from the alternate 1976, envelopes passing through clean, municipal postal exchanges still carry the original three-pence ultramarine and two-and-a-half-pence magenta Machin stamps, printed with an iridescent zinc-sulfide luminophore strip that allows optical readers to sort letters without pouring orange RM4SCC barcodes across the front of the envelope. For terrestrial collectors and retired postmen alike, the sight of the unchanged 1967 portrait on the Downlink serves as a quiet reminder of a shared aesthetic heritage that survived the branching of the two worlds.

See also