18.80 mm x 18.80 mm x 1.22 mm (thick), square “planex type” (flat top, curved inside), original vintage, mineral crystal, to fit Jaeger-LeCoultre®
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Jaeger-LeCoultre®. Jaeger-LeCoultre® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.