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British and Commonwealth Service rifles can sometimes be dated by their serial numbers and prefixes, and the manufacturing works can be identified by manufacturers' coded leter and number marks.
Akin to the longstanding hallmarking system for British silverware, in which letter codes relate to years of manufacture or importation, is an equivalent employed by the British Proof Houses.
The problem here is that, unlike silver hallmarking, the Proof House codes were only introduced in 1921 and have been only intermittently applied since then, almost on the whim of the Proof Master incumbent at any particular time.
production was proved at Birmingham and the marks should therefore comply with these series.
There is therefore an undeniable possibility that year letters after 1958 may each represent dates that should be advanced one year, with "Z" falling in 1975, although this would then conflict with the 1975 commencement of the next series.
Conjecture may suggest that perhaps there was even indecision at the Birmingham Proof House, and only a few rifles were stamped with an "I" in 1958 before "J" was substituted, or, a long shot, the 1957 "H" stamps wore out before the end of the year.