Stanley #72 chamfer plane. Hmm, concealing the auction eh, HS? After it yourself?
IIRC rumour has long had it that L-N were going to bring out their own version, or rather the #72.5, but presumably that'll be after the infill, skewed rabbet, plough etc they've also promised...
I know Stanley produced some odd-looking planes, but I couldn't help but browse a little lower on the Blood n Gore page and discovered the No 74 floor plane!!