Originally Posted by
steve21108
If the first three numbers are 131, then that SSN was likely issued in Upstate NY. I have had several bikes from the 70s with SSN engraved on the BB. It was a fad at the time to go to the police station, and use a diamond tip engraver to put your SSN on bikes, stereos, etc. Completely different view on identity theft back then. I have one of those engravers, and have not used it since 1973. They are rough.
Many people on this site are old enough to remember that social security cards said "“For Social Security and Tax Purposes -- Not For Identification" because people back then did not want centralized control over their ID and financial affairs.