Razor Serial Numbers were impressed on all Gillette razors from 1904 until 1921, and on deluxe models from 1921 until 1931 (except for a period in 1927-28).This corresponds to the time King Gillette was directly associated with the business, and may have been at his insistence.

Dorco Pace 6, £6.99, uk A disposable razor, but one at the top of its game.

With 6 blades, this is leagues ahead of your Bic disposable, and is considerably more engineered than it's orange cousin.

Any day on e Bay you can see dozens of them for sale, and relatively few bids out, at least for the common ones.

After all, they all look just the same, don't they? But look again, there's more to this razor than meets the eye.

Some razor makers put serial numbers on their razors, but we don't always have the key to how the serial numbers fit to dates of manufacture.

Gillette is one manufacturer for whom we have information on serial numbers and later date of manufacture codes that we can link to time.Consequently, dates given below as '1919–20' suggest that the mark originated between 1st January 1919 and 31st December 1920; '1919/20', however, suggests that registry was confined to the few weeks either side of New Year's Day 1920. Sudden spurts of enthusiasm for trademarks and brand names occurred in the late 1890s, when a new law was enacted; in the early 1900s, when strenuous attempts to increase exports were made; immediately after the end of the First World War, when a rapid rise in the creation of small manufactories was evident in 1919–20; and in the late 1920s, before the Wall Street Crash of 1929, when the importance of safety razors and replaceable blades became universally appreciated. This problem has been largely resolved by the creation of a number/date correlator, which has proceeded through several improvements until it can predict the date of registry with an accuracy of '± one year'. Brand names: '4S' (date unknown), 'Ariston' (1928*), 'Aso' (c. 1924/5), 'Century' (1928*), 'Cutwel' (1928*), 'Efeu' (1928*), 'Finedge' (1928*), 'Fortunato' (1930†), 'Fulmine', 'Heavy Weight Professional' (post-1945), 'Lifetime' (1928*), 'Northlight', 'Omar' (1928*), 'Pas Pas' (1921), 'Pausos' (c. 1924/5), 'Securitas' (1939‡), 'Spark', 'SS', 'Success', 'Taileffer' (1928*). A few problems remain, however, largely owing to the comparative lack of material surviving from the pre-1919 period; and they are usually most obvious at the beginning and end of each year. [Note: some of these were originally registered by Otto Stiehl (*), Heinrich Altenbach (†), and Gebr. A start has been made on linking manufacturers with individual brand names, and, in particular, to provide a date of registry for each mark. Brand name: 'Grora' (in use by 1939, originally registered in 1919 by Josef Raffel).