Two pairs by KIJ, Gothenburg 1964 and 1968, one pair by AHÖ, Gothenburg 1965, and one pair by OUB, Stockholm 1967, diameter approximately 12 mm, 15 mm, and 17 mm, dimensions approximately 14 X 14 mm, total weight 67 g.
Wear commensurate with age and use. Tarnished.