Help with vintage acrylic crystal on a Longines
2
Looking for a new crystal for a Longines 6264-20 12.68ZS (1960 something).
Does anyone know the diameter of the crystal? My crystal is totally gone so I can't measure it. The opening in the case is 30.45mm so i think a 30.55-60 could work. The shaft for the hands are high and the watch face is domed so i think the original crystal is a hi-dome type.
The depth of the fitting is only 0.8mm and there is a thin edge on the top. What type of crustal shall I use? Snapin, a crystal with underlay or a watertight with snap?
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If you're not swimming with the thing, which I figure would be the case, picking a snap in watertight crystal with the closest appropriate dimensions will work just fine. In the worst case you get the wrong size, it's a cheap crystal so just order the right one the second time! When water resistance isn't as much of a concern, you don't have to get incredibly picky with crystal geometry.