Nice gun. They are not too often found that nice. IIRC, gun was actually built on a 38 size frame for whatever reason. I had one just like that. Between the design and SN, I highly doubt it is an antique as I think that model came out right around the turn of the century, and it has a 6 digit SN. The gun looks crisp, but many of these were made and the values are not very high. Its worth around $150 give or take a few, jsyk. It probably works fine, but don't assume that it does aka check it before shooting it.
Winchester 73, the TFL user that won the west