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Weight: 19.5 gramsLength of inner curve: 5.25 in (13.5 cm)Width of gap: 1.25 in (3 cm)Thickness (at center): 1 in (2.5 cm) Hallmark: Solid Copper
Possibly from Bell Trading Co or a similar purveyor of the early to mid 20th century.
Vintage condition with lots of patina, surface wear and oxidation. As copper is malleable, gentle adjustments may be possible to customize fit.