At the July 2025 Holt's auction, Lot 1815 is interesting. A beautiful Charles Lancaster damascus barreled "12 bore" hammergun. A view of the bore dimensions are enlightening --it is listed as have bores of .704" and .703" --posing the question was it originally a 14 bore shotgun.

If any of you lads are viewing guns at Holt's before the July 2025 auction please take a photo of barrel flat proof marks and post them for us.

https://www.holtsauctioneers.com/as...++1815+&refno=++232790&saletype=

Stephen Howell