Marshall has no official dating page. The company's support area covers order tracking and, in 2026, an announcement about QR authentication for new generations — but no serial chart. The good news is that private research on Marshall numbering is unusually complete, and Marshall is one of the few brands where a serial number really does carry the year, provided you know which of five systems you are looking at.
1962–1964: a plain four-digit number
The earliest Marshall amplifiers carry a sequential number stamped inside the back panel rather than on a metal plate. The documented range runs from 1001 up to about 2001 by early 1964, with no model indication at all. Confidence here is medium at best: the number marks a place in a queue, not a month.
1965 to June 1969: no serial system, so read the amplifier
In this period researchers have identified no standard serial format, so the year has to come from features:
- 1965 — cream back panel.
- 1966 — EL34 or 6550 output valves, and Drake transformers quoted as 784-084 for the 100W models and 784-139 for the 50W.
- 1967 — the "Black Flag" panel, Dagnall transformers in the 100W amplifiers, steel chassis.
- 1968 — white logo, JTM becoming JMP, output transformer rotated.
- 1969 — aluminium panel and larger feet, beginning in July.
Sources disagree about the transformer numbers. One quotes Drake 784-084 and 784-139 for 1966; another quotes 1202-84 from September 1965 and 1202-119 from February 1967. They are probably Marshall part numbers against Drake part numbers for the same units, but no source actually says so, so both systems sit in our data side by side rather than being merged into a false certainty. The same disagreement surrounds the Drake-to-Dagnall change: one source puts Dagnall in the 100W amplifiers from 1967, while another dates Dagnall's C1998 output transformer to August 1967 and shows 50W amplifiers of the same period still using Drake 1202-119 and 1202-132.
July 1969 to 1983: model code, number, year letter
From July 1969 the format is a model code, a serial number and a single year letter at the end: A = 1969–70, C = 1971, D = 1972, E = 1973, F = 1974, G = 1975, H = 1976, J = 1977, K = 1978, L = 1979, M = 1980, N = 1981, P = 1982 and R = 1983. The letters B, I, O and Q are not used, so a gap in the sequence is not an error.
Model codes: SL = 100W Super Lead, SB = 100W Super Bass, S = 50W, A = 200W, ST = 100W Tremolo, T = 50W Tremolo and SP = Super PA, written with the slash before the number in the 1960s form (SL/) and after it in the 1969–83 form (SL/A).
1984 to September 1992: the letter moves inward
In 1984 the year letter shifts into the middle of the serial: S = 1984, T = 1985, U = 1986, V = 1987, W = 1988, X = 1989, Y = 1990 and Z = 1991–92. Reading the letter from the end of the number, as you would on a 1970s amplifier, will put you in the wrong decade.
October 1992 to July 1997: the barcode sticker
From October 1992 Marshall used a barcode sticker in the form xx-xxxxx-xx: the year of manufacture, then the serial number, then the week. It is a sticker, so it peels off and goes missing. An absent sticker is not evidence of a fake, but a present one dates the amplifier precisely.
August 1997 to today: M-YYYY-WW-NNNN-V
The current format reads as country letter, year, week, sequence number and voltage letter. Documented country letters: M = England, C = China, I = India, K = Korea. A final Z denotes a cabinet rather than an amplifier.
The trap: model numbers that look like years
1959, 1987, 1962 and 2203 are model designations, not years. Model 1959 is the 100W Lead and Model 1987 the 50W Lead, both catalogued as running 1966–1981; the JCM 800 2203 is a circuit. "A Model 1959 from 1968" is therefore not a contradiction, and the same confusion is behind a great many wrong listings. Reissues add a second layer: they are separate models with their own coding, including an RI prefix, so the Model 1959S reissue of 1988 and the Model 1959X of 1991–93 are not vintage heads.
What this means in practice
Read the plate and decide which of the five systems you are in before decoding anything. A letter at the end of the number puts you before 1984; a letter in the middle, between 1984 and 1992; a barcode or an M-YYYY-WW string puts you in the modern era. On a 1965–69 amplifier there is no serial answer to give, so confirm with cosmetics and transformer part numbers and accept a range. Our Marshall decoder runs all five systems plus the feature checklist, and the model-number trap is flagged there and on the Marshall brand page.