I have a nice 1/2" drive Lowell Wrench No 22. I believe it is not an early one given the use of allen bolts rather than straight slot screws to hold the cover. What I'm curious about are the other markings on the wrench and what significance they might have? Are they simply owner marks? Or something else? Any info would be greatly appreciated. Thanks.
Standard Front Markings: LOWELL WRENCH CO U.S.A. WORCESTER MASS. NO. 22
Additional Front Markings: B-1
Additional Back Markings: N inside a circle near the ratchet and a 1 near where base of the head.