Serial numbers ran from J370001 in 1976 to J610000 in 1977.
If it's truely unfired and in 100% condition then about $600 or more depending on location and how bad a collector wants it.
38 Military & Police (post war).
Serial numbers ran from S811120 in 1945 to S999999 in 1948.
i have the serial # it is 239xxx
S&W reused serial numbers on different models many years ago so I need to figure out what model you have first.
Is it a modern swing out cylinder or an older break-top (barrel tips down to load)?