Chuck
The section I read states that the notation on the 12 bore was made in the stock book in March 1892. The similar 10 bore note was reported to be a a few months later. This should allow you look for it pretty quickly.
Anything written is open to error, but this was a discussion several pages long by some knowledgeable people, so I doubt they were simply reporting anecdotal evidence. They seemed to be careful to report it as such throughout their writing. I for one would be very interested to know if these notations really exist.
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