I'm going to venture a guess that it's a Victory model, an early Military & Police type that was later identified as a
model 10. I have one that's been in the family since WWII, it has a 4" barrel and sn V175051. it is marked
on the barrel "38 S&W Special ctg" and there is no model marked on the cyclinder crane, just an abbreviation repeat of the serial number.
Perhaps someone here knows a source where we can date a gun by looking up the serial number.