Roy, I am attaching a picture of the proofmarks on one of a pair of Greener G70 Imperials I once owned. Note that the proof is for 2 1/2" and 1 1/4 oz. I believe these guns were rebarreled in the 1930s. I have seen this same proofing on two other Greener Imperials, but am not sure I have seen it on other guns. Does this seem to not follow the general rule we use ?