To answer your question, I have recorded one lower serial number, #37; which is also grade marked "D2" but is engraved entirely different with pointing dog scenes and birds, although the unknown engraver was a differenct individual from the artisan who engraved later SAC guns (early guns feature much lighter engraving and tighter scrolls). I am glad to hear that this SAC gun has resurfaced, as I wondered where it had gone. Someone claiming to be the owner contacted me nearly 3 years ago for information on gun #41. Basically he was trying to bait me into placing a value on the gun, which I wouldn't do without seeing the piece; although he did provide enough description so that I could understand the gun was in well used condition. He was to send some photos, which never arrived; and none of my attempts to contact this individual were successful afterwards (something I said (and I don't have a clue what it was) set this guy off; he was a disabled vet and hated the president because he wasn't doing enough for vets, etc.). At any rate, I am glad the gun has found a good home. I have found nothing to tell me what defines a D2 Grade Hollenbeck; so I would be most interested in seeing photos of your gun to compare to my example for clues. I do believe the "D" designation denotes their highest grade; but I am confused by the additional "2" stamp and the fact that mine and your example don't come close to the quality of later Hollenbeck and Syracuse Grade D guns. At one time I thought the additional stamp denoted an engraving pattern; but, since our guns are engraved differently, that wouldn't be true. Maybe the "2" stamp denotes
an amount of engraving coverage or perhaps a dollar amount for engraving? But the truth is that I really have no idea; and unless some literature surfaces to provide some clues, we must settle for the fun associated with speculating. At any rate, guns number 37 and 41 are the only two SAC guns I have located with a "D2" Grade stamp, and I seriously doubt that more than a handful were ever produced. Tom