Those aren't my locks, unfortunately. The photos I posted above were nicked from elsewhere on the web. The top one belongs to Jerry Clausen. He's got a beautiful collection posted at:
http://members.aol.com/pdx2001/padlocks/iron.htm.
The bottom one is from a listing that is currently still up on $Bay. Search for "vintage Master lock" and look in the stores section at the bottom. Of course, that one looks like someone tried to open it with a hammer at one point.
Even the lock I originally asked about isn't mine. A friend bought it through another auction recently for under nine bucks, and it works pretty smooth. It would be nice if I could find some actual years of manufacture for it.
@jellywerker: I already did hold it up to a hacksaw blade, and it's wide enough material to make a replica of the key blade, but there's not enough material to match the full key width or bang in a groove to make it a comfortably working key. That's what he's really after.
-DUKE