Via the magic of Photoshop, the various proof markings are separated out below.
Circular mark above serial number = Miroku house symbol
410677= Serial number
SP in circle surmounted by ‘horns’ over NP = Japanese nitro proof (see below)
20 = bore/gauge
MOD/FC = choke (Modified (1/2)/Full)
75M/M = Chamber length in mm (3″)
Crown over R = Reproof (although this is the first proof in the UK of this weapon).
Two crowns over SUP = Supplementary proof (1200 bar) for 3″ cartridge
76mm = Chamber length (3″)
20 in diamond = bore/gauge
Arm with scimitar over NP = London nitro proof
15.6 = Internal bore diameter in mm
LP over 09 = London proof, 2009
Miroku side-by-side Project – collecting Miroku SxS data, please add data if you can!If you have enjoyed this post, please drop me a note or subscribe to this blog using the Subscribe function on the Home Page. Thanks!