Here is a response from Joe at the Craftsman Club Board
He said to check with Pete Mazariz (spelling?) at Schumaker. Pete should be able to tell if this is an old vendor code they bought out.
Is he the guy that runs the OWWM OEM list for Craftsman? I've e-mailed
As others have noted, the switch can be matched up by any electrical shop.
I looked up my "200" series Schumaker and it has numbers for part #s, not letters and numbers. That leads to me to believe it's not a Schumaker or it's an older company that Schumaker bought out. Pete M. will know this for sure.
If not, it may be a Solar, Goodall, among others.
USUALLY, the older Sears units had "Schumaker" stamped on the alligator clips. Mine doesn't. My neighbors cheaper Sears does (it's also a 200 Series like mine).