I’ve been wearing a 1967 Crystal Date for the past couple of weeks – this is the date only version of the Crystal Seven, and is one of the 52 Movement Family members. This 17 jewel model has the 5401 movement in it (54 = date version, 52 = date and day version):
I really like the lumed hand set on this model, especially the elegantly slender minute hand. But what is really impressive is its time-keeping performance – I haven’t had to adjust it for two weeks, which is quite remarkable in my opinion for a watch of this age and with no recent service / regulation. I suspect many modern high end mechanical watches would do no better than this I suspect.
For a bit more information see here: https://sweep-hand.org/2012/05/10/this-weeks-featured-watch-32-the-crystal-date-17j/