That's a Rice's patent slitter.  Patent is here http://datamp.org/paten
ts/advance.php?pn=142584&id=38&set=7">http://datamp.org/patents/advance.php?pn=1
42584&id=38&set=7
Usually marked on the arch of the outside brass depth stop piece with the patent
info.

Ed O'

-----Original Message-----

Not sure why they are called "pizza wheels” - maybe cause they look like a pizza
cutter? - but here is the real deal, extra large pizza size

https://www.jimbodetools.com/collections/whats-new/products/extra-
fine-14-1-2-inch-panel-gauge-860021u">https://www.jimbodetools.com/collections
/whats-new/products/extra-fine-14-1-2-inch-panel-gauge-860021u

No affiliation, yada, yada, yada

Ed Minch