Originally Posted by
Pontius Navigator
A part, in addition to its reference plate often has another plate which is the Mod State. A simple plate with a table of numbers, say 1-50. When the design is modified to a new standard then the new Mod Number is punched on that plate.
Aaargh, Sometimes known as the strike plate. Confusingly, not every strike off mod resulted in a change of part number
Each strike number referred to a specific assigned mod but that might not apply to every part manufactured to the part number standard