All about Gruen

[Fred]

10X is a 21-jewel, 12 size Extra Precision movement per 1917 blue book, although I suppose it could be 10 size with a spacer to hit 12.

+$50 vs VE in 1917 (that’s 70% higher movement retail cost!)

Call me crazy: I think 10X is Glashütte, the 12-size caliber.

Here are the “movement only” prices, for the current production movements (10X not sold uncased)