19.20 mm x 19.20 mm, c-shaped original plastic crystal mounted in a steel top case (case back not included), overall case size (excluding the case lugs) is 29.50 mm x 24.10 mm, to fit Ingraham®

* Perrin Supply Ltd is independent of and not affiliated with or sponsored by Ingraham®. Ingraham® warranty does not apply to parts supplied by Perrin Supply Ltd.