Are you sure there is an "L" in Bowler?
Levine's Guide lists an "F.A. Bower"...no "L".
Says that Bower was a US importer of knives in the 1950s.
Was in Jacksonville, FL.
Levine rates value as "low".
There were lots of knives imported from Germany and Japan in those days...and later..many were standard models and only varied in that the various importers had them marked with their own brands.
Stamped numbers were, I believe, item numbers to assist ordering.
Pictures might help someone, though.
A message to denialists, everywhere:
IT BLOODY WELL IS!