Charles Osborne Sidelock, 12 bore, 2 1/2" chambers, 30" fluid steel barrels with original nitro proof at 1 1/8 oz. and reproved at 3 TONS, choked .000 Cyl. and .036 Full, 14 15/16" LOP over a pad, 1 1/2" DAC, 2 1/4" DAH, 1/4" cast on for LH shooter, 6 lbs. 14 oz., extractors, double triggers, straight grip, splinter fore-end, concave game rib engraved with "Charles Osborne & Co., London", automatic safety, a non-engraved sidelock with greener cross-bolt, retains about 50% case colors, shows some fading barrel blue and a few external pits and two internalo pits in the right tube, min. wall thickness on left barrel is .025 and the right barrel is .021 with the wall thickness in the two pits on the right tube being .018 and .019. Otherwise a tight servicable gun.