Originally Posted by Vern
The only reference I have with the double arrow through circle mark is a Xerox copy of the Solingen Blade Makers Directory dated 1950.

Hello Vern,

Can you please let me know the exact title (or cover) of that 1950 "Solingen Blade Makers Directory"?
I have access to several sources where I might cross-check (or scan) such a reference book.