Update - I looked closer at the stamp today and realized the pad has been evenly filed or ground down at some point, and the font looks a little small, so it was restamped at some point. This unit has been in my 67 since mid 1980s when I bought it, so I doubt the work of counterfeiters. I think the partial matches up with the pan date-wise, so possibly it was restamped at the factory? Don't know if anyone would bother stamping a rebuild. Anyway, just wanted to point this out in case this info goes into a database. Maybe needs an asterisk and a footnote.