Does it have "U. S. PROPERTY" stamped on the topstrap? For the SV-series Victories, there is very little relationship between the SN and the shipping date. Without a letter, all that can be said with reasonable certainty is that it shipped sometime in 1945, prior to the war's end. Unless it is a civilian SV, in which case it shipped during the early months of 1946. Those were made up from earlier parts remaining in S&W inventory after the war's end.