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What do you think of these?
https://www.spiralwinderwatchparts.com/product-page/custom-speedmaster-caseback-blank
Not too bad..... the anti reflective coating gives a very clear view of the movement 馃槑
Mine had a very minuscule fleck of dust between the crystal and seal, but I removed the crystal, removed the dust and reseated the crystal.
After fitting the caseback, I then pressure tested the case to 3 bar and no problem with any leaks 馃憤