On my site i say:
"Crest and Seal" chips are clay chips with litho inlays and flat rims, i.e., no embossed mold rims). It's that simple: just those 3 things: clay chip, litho inlay (meaning no die cut or reversed die cut inlay), and flat rim mold.
What I was always led to believe anyway.
Robt.
.
.
.
.