Evening! I’ve spoken to a couple of members here who’ve been keen on the idea of modifying the PRS-25 from a Sapphire to an Acrylic Crystal. I thought I’d give it a go.

Using dimensions provided from one of the case drawings and post #135 here (https://forum.tz-uk.com/showthread.p...Smiths-Everest) I set about ordering some tension ring acrylic crystals in several diameters above and below the suggested 31.5mm.

A bit of trial and error letter, and a bit of adjustment to a tension ring with a dremel tool and.... success. My chief concern was getting water resistance with a acrylic crystal. But the tension ring helps there. I checked the case in the testing tank (up to 6bar) before reassembly - no issues.

Here are some photos of the completed watch:









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