Herb Orre was a famous Ohio Trap shooter, and specialized in choke work on Trap guns- wonder why the right barrel is Full, and the left barrel is Mod- when with the famous Winchester M21 single selective trigger, you can choose at will- Unless he (Herb) was like John Olin, and always fired the left barrel first on all his M21 doubleguns, to avoid "torgue" so I have read. Buy them both if you can afford to do so now.
I am almost 'there" on a 12 M21- a shooting pal from our hunting club has two for sale privately- (he does NOT have an e-mail address) a 1939 Skeet 12 with 28" barrels, SST, EJ, PG, original pad, smaller field style Beavertail- and a 1951 mfg. almost identical gun, except it is in the "bastard gauge- that being 16 of course, and I believe it has 26" barrels- Wish I could afford to buy them both, keeping the 12 of course, and possibly selling the 16- we shall see. The older quality ones made before 1960 always seem to appreciate on the market, and the M21 is the only American made doublegun with a SST that is almost foolproof-