Link to a completed auction for a "1015-1917 S&W Mark II Hand Ejector".
Vintage 1915-1917 Smith & Wesson Mark II Hand Ejector Pistol - Revolvers at GunBroker.com : 896405065
Not something I am familiar with except from gun shows and online, so I was looking at this one mostly to see what I can learn.
The gun was described as 60~70% of original finish, but does not look like a polished blued gun, more like a 1940's Victory. British and Canadian proofs on the left near the hammer.
Marked .455. on the left side of the barrel. Listing was updated to say that a buyer noticed from the pics that the gun was converted to .45 colt. I read up on that here, but I am wondering how one can tell from pics alone. The face of the cylinder looks original to me, with s/n (??).
I have seen a couple similar guns at local shows, both from the same estate sale, I believe, and probably not identified very well and going unsold, so I must not be the only one who is confused.