New Mineral Glass Crystal for Seiko 6138-0030 , 6138-0031 kakume, We Also have the New Blue Ar Glass for the same watch. (Note: This listing is for a mineral glass with NO AR Coating. ) The Ar Coating is helping to protect your Dial and hands from the sun light. The Blue Ar coating glass in some angles it look the watch does not have a crystal on it, so you can see the dial and hand very clearly. Diameter is 34 mm. watch is NOT included. Please do not hesitate to contact us if you have any further question. Please look at our other listings, If you want any kind of our items in a larger quantity, feel free to contact us. We stand by our products 100% and if by any chance you are not satisfied with your purchase, We will gladly accept returns with no questions asked.