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Square frame with round sight…
anonymous, c. 1950 - c. 1989, frame, SK-L-41
Square frame with round opening,…
anonymous, c. 1950 - c. 1989, frame, SK-L-40
anonymous, c. 1950 - c. 1989, frame, SK-L-41
anonymous, c. 1950 - c. 1989, frame, SK-L-40