Outer diameter: 1 7/16 in (36.5 mm). This is the outer diameter of the clock face. Inner diameter: 1.28 in (32.5 mm). This is the opening where the watch fits. When the ring gasket is included, this increases to 1.36 in (35 mm). Assembly depth: 1/4 in (6.35 mm). Please check Picture 2 to confirm that your size requirements match the dimensions. The miniature watch fits the fitup part and is compatible with many small glass and crystal clock types. Movement: quartz. Key benefits - Precise, compact replacement insert for small clocks - Standard dimensions for easy installation and compatibility - Suitable for retrofits, repairs, and DIY clock projects Use scenarios - Replacing the clock face insert in small glass or crystal mantel clocks - Retrofitting compact quartz movements into decorative crystal clocks - DIY clock projects and hobby clock restorations requiring a small insert with quartz movement