![2.50 mm Magnifying Crystal (18.5 mm to 23.0 mm)](http://perrinwatchparts.com/cdn/shop/products/CR-MAGNIFY25_fff612a3-a0a2-4d45-97d6-dcd15b26c882_300x61.jpg?v=1684873513)
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.