Far as I recalal, in my entire past, I have only sold one Gun, and, it was a minty Colt Python Target .38...I was not using it, and, though I was participating in Target Competitions, I preferred to use ordinary old Revolvers with plain 'Half Round' Service Sights.
No one wanted the Python...it was a hard sell...finally, I accepted $225.00 for it...this was in the early 1990s.
Otherwise, never sold any.
I did trade a horribly re-finished ( but with crisp texts and edges, no hint of any pits, ever, ) Model 1905 Colt .45 ACP Pistol...I think someone had tried to do a Phosphate finish on it, but other than looking a yucky shade of dark 'grey', I do not think it had ever been buffed or anything. Anyway, traded it straight across for a lovely, low use, some Plum and Holster wear, circa 1914 Colt New Service target Model in .44 Russian/Special, which was in a very nice state of ohhh, 65 percent Blue I'd recon.
Sometimes I wish I would have just bought the New Service and kept the old 1905 which I now know, I could have sent off to Doug Turnbull and had done right with minimal prep or hassle.