Product Description
Gold plated Waterproof Screw Down Crown for Chronomat models: 81950, B13047, B13048, B13050, B13050.1, B13350, B13352, B20048, B20348
Made in Switzerland
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Fits factory tube
This crown fits the factory tube of about 3.9mm, however the tap size is 10 on this crown. My watch had a tap 7 stem, so you can buy a tap 10, 7750 stem to work with this crown (also available on this site). The Breitling tube elsewhere BRT-24 does not fit this crown, that tube measures about 3.4mm threads.