This crystal do not have retaining ring please use the old one. If you are looking for other vintage Seiko parts.Please do not hesitate to ask us. The item "NEW CRYSTAL FOR SEIKO6138-7000 CHRONOGRAPH SLIDE RULE CALCULATOR" is in sale since Wednesday, October 28, 2015. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Parts, Tools & Guides\Parts\Crystals". The seller is "vintageseiko4ever" and is located in Bangkok, Bangkok. This item can be shipped worldwide.