No US published sn data.
No known sn data published.
Date marking is determined by a two letter code inside of a square. Not by serial number.
No published sn data.
40-210 or so
Could be part of the sn, could be an assembly code, could be a date code, could be part of model designation
Proofhouse.com has sn tables.
It was made in 1979
Glocktalk has extensive sn data.
Proofhouse.com has Colt sn data.
No published sn data
the Sn crosses 1956/57