Featherweight (metal strip down center) 1.32" edge-to-edge Sprint Veloce (plastic ridge down center) 1.58" edge-to-edge "no name" (metal strip down center) 1.6" edge-to-edge Club Special (plastic ridge down center) 1.6" edge-to-edge All Rounder ( smooth rounded center) 1.79" edge-to-edge
None of my older ones (NOS or used) earlier than early 60's have no names stamped on them.
Hope this helps!
Dale Phelps
Montagna lunga Colorado