In about 1993, at an Ohio Gun Collectors Assn. show, I passed up a deal on a Harrington and Richardson A Grade double because it had those damn nasty dangerous unshootable Damascus barrels. It was a 12 ga gun and was very profusely and beautifully engraved and had very nice wood. The asking price seemed very reasonable for the quality. In truth, I had no idea that H&R ever even built a double, and I thought they had mostly made cheaper lower tier single shots and revolvers. The Blue Book I had with me was no help and didn't list them at all. When I did some research and discovered what I'd passed up, I was kind of sick about it. I don't recall the production numbers, but I know they are scarce and very few A Grades were made.
When I hear guys hem-hawing about buying a gun, I tell them I never regretted buying any gun... but there are quite a few I regret not buying. This was one of them.