Looked and didn't see that. Good catch.
if you look close, you can just barely see the "SHP" on the tank regulator i the second pic. or, just the "P" and half the "H".
I just picked up a superlite (SL) 68/4500 a few weeks ago, and I love the damn thing. It's almost the same size as a 48/3000 aluminum tank, and it weighs