Date Nail - circa 1951
by cpurser

Comment:
This nail is most likely not marked 1951 but number 51. These type of nails were often used to mark old wooden storm windows and screens to match up with the proper window. One would be nailed into the window frame and the duplicate number nailed into the storm window frame. The old wooden ones were taken down in the summer and put back up in the fall.
I still have a cardboard package that contains such matching number nails.

Petrer