They are made for a Rolex GMT with a plastic (acrylic) crystal for 1670, 1675, 16750, 16753, 16758 and others. RETAINING RING + BEZEL+ INSERT FOR ROLEX GMT BLACK 1670 1675 16750 16753 16758. RETAINING RING BEZEL & INSERT FOR ROLEX GMT BATMAN 16700 16710 16718 BLACK/BLUE.
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