Hi there, it's good to be back. Had not been really active since the transition to the new forum. Lots of new names and a few old ones. Are Osprey and Smitnut still around? What about Jim Supica himself? I loved their posts.
I am aware letters are normally a plain statement the date of manufacture according to the serial and to whom/where the gun was originally shipped, but I speculate, perhaps wrongly so, that there being no SN (provided S&W agrees they made the thing at all), given the unusual, to say the least, configuration, and having aroused the interest of the said factory historian extraordinaire on the parallel forum (as we are told it has), they may think it wise to dig a bit deeper than usual (a note accompanying the factory letter request from the forum's powers that be, if one can be obtained, saying this is the very gun that was discussed at some length would not hurt, I guess). And if at all possible I would not send pics, I'd send the gun.
And yes, I meant to say that it was not clear to me what the owner's intentions were when he took it to the gun shop to had it looked at. Usually people do that with a prospect to sell the thing.
If it was brought to me, I'd recommend to have it inspected first hand by an expert (preferably one I consider that than one that calls himself that) and ask him to put his observations in writing (or at least agree to have me quote him on the matter in my own catalogue description).
Another thing about the provenance: is the story corroborated in some way? Sometimes people do not intend to mislead but rather fill in the holes in the story with what they consider evident and you would not necessarily do. For example, great-grandpa West was a known gun guy, the gun was among dad's possessions, and there is no doubt in the grand-granddaughter's mind it's been in the family for ages, even though she didn't even know the gun existed. This may not be the case here, and in fact the story seems to add up, but I'd need some more to validate it (some sort of paperwork, ideally--heck, a pic of old Mr West holding a gun that looks a bit like it at least).