Our 1-7/16" (37mm) mini clock inserts (fit-ups) use Seiko Japanese made movements. The back is solid stainless steel with glass crystals and alloy bezels. Each fit-up is supplied with a flexible gasket for a snug fit and easy installation. Battery is included and is easy to replace when required. We stock an extensive assortment in white, ivory, gold and fancy dials, gold and silver bezels. We stock matching thermometers, hygrometers and picture frames to go with our 1-7/16" clock inserts.