You fail to mention what model the gun is. Either way, if the gun is 95%, as you state, it sounds like a good buy. My assumption is it's a Remington 11-48, which is a fine gun, just that recoil is a tad more than an 1100 or 11-87, as the 11-48 is a spring operated action like the Browning Auto-5, rather than a gas operated action. I'm also basing my assumption that it's an 11-48 due the the Poly Choke, which is time period correct for that era. While I've never used an 11-48, I have a neighbor that has one in 20 gauge, and he likes it very much.
Poly chokes were a very popular option to a shotgun prior to the screw in choke era, and again, while I never used one, the people I know who have(had) them, never had any complaints and liked them very much. I think the fact that the Poly Choke Company today, is still alive and well is testament to that. Very innovative company, that makes quality products, and right here in the USA, they even have a 'Poly Choke II' designed to be used in place of a standard screw in choke for a variety of shotguns:
http://www.poly-choke.com/Considering that a new Poly choke II goes for close to $100, makes the gun an even better bargain to me at that price. If it was me, frankly, I'd buy the gun just for the opportunity to play with and pattern some loads with the poly choke, but of course, I'm a bit of a gun nut. The EX used to say it was a 'disease', I guess thats why they call them EX'S, LMAO. Unfortunatley for her, the kids inherited the same 'disease' and chose to live with the 'gun nut', smart kids them kids, LMAO.