Would be odd, given that STG just took over the Peterson range of tobaccos - I can't imagine them doing so in order to kill a bunch of them off (although stranger things have certainly happened).
Quick check though, and yeah, it's outta stock all over the place. Huh.
The signature flake is good - not as muscular as the PPP by any means, and that hint of lakeland sauce in PPP is all but missing in the signature - it is there though, just in very small quantity - I have only tasted it in a new pipe to be honest, but it occurred in 2 different new pipes - surely not a coincidence....