Jeff, that's so called "French Walnut" and that was the standard wood for Trap and Field grade guns on the mid-sixties 101's I like. Incidentally these 101's are old school steel and walnut, and the steel frames are hand engraved. Chambers, bores and chokes are flash chromed and they're a breeze to clean and only once in a while. Excellent guns including a 30" Double Trap version with F&F chokes I've been shooting at sporting clays. The o/u versions have mechanical not inertia triggers.
Stan, a good question. As one who's studied choking on Super-Fox and similar
Special Long Range guns, I fully appreciate what Olin Kodensha did on these 101's. Similar to most Supers, there's a slight bore enlargement (swell) leading into the choke. The 32" guns were marketed for standard 16 yard Trap and mine is stamped Improved-Mod and the choke is full tapered from the swell to the muzzle at 28 points of constriction. The 34" 101 was intended for Handicap Trap and the choking is similar profile but at 38 points.
Here's a pic of that 101 Double Trap taken last week while shooting. frank