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Gräfenberg Rings on cardboard

Mounted on black cardboard: three Gräfenberg Rings in different sizes and alloys.

Inventory number: 1866
Material: metal, german silver (alloy of copper, zinc, silver)
Dimensions, in cm: 16,8 x10 x 0,3
Condition: very good
Artist: Ernst Gräfenberg
Donor: Robert Snowden