Possible as there was a statement in the Perris letters about the breakage in fitting non metal plates.
SRAC 51xxx
Thick 77xxx
Thin 116xxx (earliest 1899-H I have)
When did the thin rubber plate start? The first 1899-H in my data that is not engraved is in the 69xxx range. Not many H's till the .22HP came out. I guess I need to look at some log sheets.
