Model 75 single blow air hammer used for QC acceptance mark

Customer needed to mark part after successful test. The part is fit into a testing stand to determine if the product is made to specifications. If it passes the test it is marked with a two digit acceptance mark. The model 75 single blow air hammer is used to make with mark while the part is still in the test stand. (2) 1/8” characters into sheet aluminum provides a clear mark.