Vintage Lot Swiss Favorite Watch Crystals 300+. These are from old stock of a closed watch repair shop and range from 31.1mm. to 32.8mm. with yellow tension ring & 34.6mm. to 34.9mm. with silver tension ring. The least I found in any box was about 15 crystals of one size with some about full (50 crystals). Very useful for the watch repairman or sell individually for a profit. See pics. Shipping via USPS Medium Flat rate box. NO RETURNS on these. Thanks.