Originally Posted by Drew Hause
The original proof was likely 1887-1896. 1896-1904 would be marked 1 1/8 oz Max. 1904-1925 1 1/8 oz Shot.

Just had a read through this thread.

I'm curious about Drew's statement re: the 1904-1925 Birmingham Rules of Proof. My understanding was that during the 1904-1925 period, Max. Shot, or Grains were omitted after the Nitro Proof 1 1/8 designation? Am I mistaken on this? At least that omission seems to be the case for my two 1904-1925 Birmingham shotguns.

UK Proof

Diggory Hadoke's Vintage Guns website also shows the the Nitro Proof as having the SHOT mark following the Nitro Proof designation. Vintage Guns Proof Mark Dates

I'm now a bit confused.

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TC