Intermixed Alphabet Commercial t and u suffix, blank toggle, right receiver army WaA66 acceptance (c/N civilian proof left receiver) or right receiver WaA66 acceptance and two other eagle proofs (various styles) without civilian c/N left receiver proof.
SPECULATION and it may be that the parts (blank toggles) themselves were prepared earlier for the failed Rif contract, but not actually used in assembly until approx. 1928.
--Dwight
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