My 12 ga. Win. M-23 was made for sale in Europe. It has 1/4" of cast, and the straight wrist is exaclty 4-1/4" circumference. So, a through-bolt doesn't necessarily mean a fat wrist. This is much thinner than the wrist of the standard 20 ga. M-23 I once had.
Winchester made another European M-23 that was more like the standard U.S. gun. Mine has different "engraving", splinter forend with ebony forend tip, solid swamped rib, 14-3/4" LOP over a checkered rosewood buttplate. Weighed 6 lbs. 10 oz. before I replaced the buttplate with the pad.
Larry, I bought this gun not long before your article on 23s.
Jay
