Better late than never...

German manufacturer for FINEDGE OSTISO N.Y.C. was Peter Altenbach & Söhne SCHWANENWERK (SWAN WORKS) in Ohligs-Solingen.

I recently got one very old ORIENT RAZOR of them:

Name: Altenbach,Peter &Söhne Ohligs (Allemagne) 11-16'' Rund ORIENT RAZOR Hornheft €12,50 marktplaats .jpg Views: 992 Size: 48.5 KB

A typical 5/8in Square of FINEDGE OSTISO looked like this one:

Name: Altenbach FINEDGE CutCorp. OSTISO NewYorkCity 5-8'' Square HANDFORGED M.i.Solingen,Germany a.jpg Views: 961 Size: 55.7 KB

Sharp Greetings from Razortown
Rainer