1) 1940s to 1960s Hamilton, 14K yellow gold, 5/8" or ~16mm opening. Price $185 (6 available)

2) 1930s to 1950s Simmons, 14K white gold, 5/8" or ~16mm opening. Price $325.

3) 1920s to 1930s Unbranded (step design), 14K green gold, 5/8" or ~16mm opening. Price $350.