Mine is marked - Barcalo - Buffalo - U S A - , cadmium finished. DOE, 15/16 and 1".
While the example in AA doesn't give a date, aren't there general dates for the use of cadmium plating? That could give a clue to the dates of the "geometric panel" Barcalos. AA does note that their tappet wrenches in the 1934 catalog came in "sand blasted steel" or cadmium plate.