This is a top quality sapphire crystal made to exact specifications and size as the original. The magnification for the crystal cyclops is 2 1/2x (just like original). This crystal hasno lens effect. Most of the cheaper ones have a very bad lens effect.It will fit single quick or double quickset President, Datejust 36mm Watch including 14270, 16008, 16009, 16019, 16058, 16078, 16200, 16203, 16220, 16223, 16233, 16234, 16238, 16248, 16258, 16263, 16264, 16518, 16520, 16523, 16528, 16628, 17000, 17013, 17014, 18000, 18026, 18028, 18029, 18038, 18046, 18048, 18049, 18078, 18079, 18206, 18208, 18238, 18239, 18248, 18249, 18308, 18346, 18348, 19018, 19019, 19028 and others.

This sapphire crystal comes with pressure resistant nylon gasket made just like the original and your watch will be waterproof.