This is hammerless, and blows the Savage 220 and the Winchester 37 away, quality wise:

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=300515507

They turn up in 16, 20 and .410, also. This guy is a little high on price, but, the gun is high condition. Chokes are always pretty tight, factor a brutal reaming into the final price.
I've owned one for 40 years. Decent single shots.

Best,
Ted