Fortunately, many of these scholars make their work available to the public in reference books, and details of a number of the most useful ones are to be found in our Bibliography. The only exception to this is a comparatively recent situation in which the acquirer of a historically important firearm that may have been re-imported, and hitherto have carried no London or Birmingham proving mark, scan request, when that arm is sent for the necessary proof that, the marks are put out of sight, under woodwork for example, in order that the original appearance of a valuable piece is not spoiled..
It is worth mentioning one or two books in particular from which much data relevant to this website's subject matter can be sought. However, date marks such as are under discussion and described below, are usually out of sight on the under-side of the barrel, and removal of fore-end furniture may be necessary to find them.
The two markings are shown below, the International to the left, and Century to the right.
From 1975 a further modification was made to the mark, as in Figure III, with another adjustment soon after to Figure IV.
Do remember, though, that date information coded with proof and Proof-House inspection, viewing or identification marks, does not necessarily coincide with the date of manufacture. have, for many years, been legally required to carry proof marks from one or other of the Proof Houses.For the latter, dates of introduction of military arms can be located within the Government "List of Changes" (Lo Cs) as can dates of obsolescence and of modification or upgrade to later marks.Basic information on these lines is on site from our .However, we have been made aware, by a contributor, of two contemporary rifles, a BSA Mk.II Lightweight Martini International and a BSA Century, that each carry what certainly appears to be the letter "I" in the left quadrant (as in Fig. This would suggest that "I" as well as "Q" was no longer deemed to be ambiguous, as had previously been the case with the Fig.1 stamp configuration.