V543xxx

On my list bracketing yours are V5371xx shipped 4/44 and V5492xx shipped 3/44. Yours should be around there.

Your BSR has reamed chambers to use .38 Special ammo. Very common, also removes any collector value. You have a $300 shooter, not terrible especially with those grips (if Sambar). You can find lanyard loops easily. Check eBay.