Good sleuthing. Yes, I see that Hougart attributes it to C. G. Wallace smiths and Little Joe Begay specifically in at least in some cases. The Messiers don’t seem completely confident in their attribution but say “the tomahawk hallmark was probably used by Navajo silversmith Austin Wilson, who worked for C. G. Wallace and other Zuni traders.” Since Wilson worked for Wallace these assessments are not entirely inconsistent.
And yes, I do remember seeing that other knifewing necklace of yours. Very nice.