This would explain why US reg lack rego on the wing.
Quote:
Until December 31, 1960, the required location for display of nationality and identification marks for fixed- wing aircraft was the wing surfaces, and the vertical surface of either the tail or fuselage. Effective January 1, 1960, all fixed-wing aircraft were required to display identification marks on the vertical surfaces or either the tail or fuselage. Wing surface markings were no longer required.
https://www.faa.gov/licenses_certifi...umber_history/
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