1978
1958
1941
1949-1950.
SN does not have enough numbers.
Charles Petty's book might have it.
The model designation you give does not show up in any of my Hi-Standard or High-Standard references
Contact High Standard with the Serial Number and they will tell you when it was manufactured.
See link below to High Standard data. You did not give us model number.
50 to 60 years ago or so
No way to value with just the sn.
Sometime between the late 30's and 1950