Barrels read Mod/IC. Advertised as IC/Cyl
Whomever F's with Model 21 barrels and chokes (with so few made) should be horsewhipped.
I once bought one from a Canadian dealer. Very low serial number, early production. Price wasn't nuts, so I rolled the dice. Because of the discrepancy between the listed and stamped choke descriptions (not described in the listing), and because the forend was sloppy-loose, also not described in the listing, I sent it right back. Too much trouble for me to un-fudge; it's not like I live next door to a competent double shotgun 'smith. Got a full refund minus return postage. I've learned to ask for deeply-intrusive pictures and descriptions of condition and conditions of sale since, from private sellers and dealers alike.
But. I can at least say I owned an early Winchester Model 21 for a week. I like them, as a species.