You should be aware the cost of a letter is $100, and is unlikely to provide much information beyond the exact shipping date. It will not provide any information whatsoever about what happened to it after shipment from S&W. Being modified, probably very significantly, your Victory has no collectible value.

Regarding the SN V231531, the closest SN I have listed to it is V238853 which shipped on 2/26/43. S&W was making around 1000 per day at that time.