Gillette (US) dating — multi-code lookup

System	Period	Rows	What it dates
Gillette date code (letter = year, digit 1–4 = quarter)	Razor Emporium: “used from January 1951 until 2001”; B&B: 1950–1988; gilletteadjustable: 1955–1988; vintagerazorshop.eu: 1950–1988; Shave Dad: razors 1950–1979 (razorTo=1979), the cycle chart up to 2004	55	The stamp is in the left and right upper corners of the UNDERSIDE of the guard, on three-piece and one-piece models (RE). On a three-piece it is easie
Gillette blade date code (the same letter+quarter, the blade era 1930–1949)	blades are coded from 1930 (B&B, Shave Dad) or from 1931 (RE prose, htfbw) — see C4; after 1950 the same system is used on razors too	20	Blades from the set give only a ROUGH date for the razor: B&B warns plainly “This is not 100% accurate, since the blades may not be original or may ha
Gillette plant / country marks (a letter as a plant mark, NOT a year)	printed in the 1921 row of the Razor Emporium table; Shave Dad phrases the rule without a year	4	This is not a date code and not a year suffix. The decoder must recognise such letters as a plant mark and NOT apply the US table of years.
Gillette US serial numbers 1904–1931 (a cross-reference)	serial numbers were stamped 1904–1921 on all models, 1921–1931 — only on deluxe ones (RE); the window without numbers 18.10.1927–27.08.1928	0
Gillette US 1930–1951 — model → a window of years (“NDC years”)	B&B: “In 1930 Gillette stopped using serial numbers on razors … razors made from 1930-49 can be difficult to date precisely”; codes on razors resumed in 1950/51 (V/W)	28	This is NOT “enter a code → get a year”. The input is a model/variant name; the output is a window of years. An exact year is set only where the sourc
The era of Gillette blade packaging (the blade as a separate dating layer)	1903 → the 1950s; blade codes from 1930 (A = 1930, B = 1931, the digit 1–4 = the quarter)	23	The layer serves two purposes: (1) to date the consumable itself; (2) to date a 1930–1949 razor indirectly, if blades come with it. B&B warns plainly:
The era of the case and set (the case, the insert, the papers as a dating layer)	the 1930s → the 1970s; a separate prop — mr-razor's 10 dated price lists 1910s–1958	7	The case dates the SET, not the razor: the razor may have been put into another case. There are no direct “case → year” tables in the sources — only d
Resolver: how to tell close models apart	1934 → 1988	8	the resolver does not date — it tells apart models whose windows overlap. The site must ask for the markers first, then show the window.
Safety: condition and what it does to dating and price	does not date; caveats the site is obliged to show next to a date	5	This is not a dating system.
Gillette England — the serial-number prefixes of the Leicester plant (E / F / G / H)	«Gillette's earliest British factory was in Leicester, England, and began its operations early in 1909. As best as we can currently tell it seems that it probably ceased its operations sometime between 1914 and 1915, and Gillette had apparently vacated the facility by 1916.»	6	THE MEANING OF THE PREFIX IS NOT ESTABLISHED — the source prints three hypotheses and picks none of them. The decoder must answer “a British razor wit
Gillette England — the type of patent stamp (a boundary, NOT a year)	the source sets the correspondence “Patent Stamp Type 1 = Brit.Pat.No.28763 of 02”	2	These are PATENT DATES, not a year of manufacture. BR.PAT.No.28763.02 — a British patent of 1902; PAT.NOV.15.04(.N) — a US patent of 15 November 1904.
Gillette Canada (Montreal) — numbers with the prefix C / PC and without a prefix; the 1Z series	“The Montreal plant began low-volume production ca. 1906-04-??, increasing through 1907”; in WWI most razors for Europe were made in Canada	6	KEY POINT: no year can be derived from a Canadian number. Verbatim: “The serial numbers for known Canadian razors are somewhat spotty and even contrad

Date this razor.