This is a Watch Protector Glass Guard. It's a protector that you thread onto the strap to protect the glass. It is currently out of production. It is deadstock. It is a large size. It fits up to about 22mm. The color is blue (light blue). It can be used widely, from divers' watches to automatic and hand-wound watches, and even regular watches. How about using it for everyday wear? It's lovely (*^^*) I am decluttering, so I am selling many items I collected in the past and watches with unconfirmed operation‼ Please be sure to check my profile before purchasing. This is a glass guard to prevent scratches on the watch glass. Please use it by threading it onto the strap. It is deadstock, but it is a product from several decades ago, so please understand. It is a large size. It is especially recommended for the coming summer (*^*)