Thanks Mark. I was aware of the reprints: there are scads of them on eBay, to the point where I wouldn't even consider a purchase outside a TPG holder or from a dealer I know who knows the issue. I was only looking at this issue because I purchased this card recently:
Normally I'd worry that the card itself wasn't authenticated but the signature is spot-on (I've been collecting his signatures for 20+ years: I know a good one) and Lefty died in 1969, so I figured the card was very likely a genuine 1949 SK example I did not have yet.
I can't believe no one has even graded a single Lefty with PSA. Guess I will have to send in my 1948.