SMLE15, your revolver is a Smith & Wesson 2nd Model Hand Ejector. This gun is not a 1st Model as stated in the auction catalogue, nor is it a 1917.
I did not attend the auction but I do have the catalogue and have also looked at the photograph on line. If any Forum members want to look at this go to Australian Arms Auctions Oct 2017 sale and look for lot 482. How anyone can describe this gun as in good working order and very good condition, as the description states, I can't fathom. It has been destroyed by the sawcut in the barrel. This is an example of the poor descriptions that are so common with AAA.
The people who destroy guns like this are, to put it mildly, philistines. If I stated my true opinion my intemperate language would have me thrown off the Forum.
Frank S.