Ratdog,
You are correct, this eagle is the one associated with power-proof, appearing on the right receiver, barrel, and left breechblock; found on S/42 (4-digit year), code 42, and byf P-08 (Whittington, vol. I). Actually I believe I remember seeing this mark on a G date as well, but no longer have the gun and cannot check.
As I am discovering with Imperial guns, in practice these stamps were sometimes used at variance with what one expects from official instruction, and at such times one can deduce nothing from their application.
--Dwight
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