![2.50 mm Magnifying Crystal (23.5 mm to 40.0 mm)](http://perrinwatchparts.com/cdn/shop/products/CR-MAGNIFY25_3c82ebb8-f4c5-4339-9205-07bd75bb8d05_300x61.jpg?v=1684873514)
Domed top and flat bottom – aka Single Dome - approximate thickness at center is 3.60 mm. This crystal gives a domed look without the need for hand clearance and adds a slight magnification to the dial. This crystal is finished with a polished top edge.