Cleaning plexi crystal in isopropylalcohol

Archer · Jul 25, 2024

DrSpock
Maybe the chance for me to ask:
Is it possible to get old NOS crystals (40-50 years old) “soft” again? In the past a watchmaker told me that one of my NOS crystals cracked while trying to fit it onto the watch..

Not that I am aware of.

billiout · Jul 25, 2024

mseamaster
Interesting.. Are you sure it's acrylic btw?

I've always wondered what's on KS/GS watches. I've read it's hardlex which I am starting to doubt now. Perhaps it's just acrylic.

It's definitely acrylic since Hardlex crystals were not introduced yet when that watch came out. I also have a no-date 45KS in all-original pristine condition, and I'm quite certain that its crystal is also acrylic (it's not cold to the touch, and tapping it produces the typical plastic sound).

Cleaning plexi crystal in isopropylalcohol

Archer

billiout

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