15.20 mm x 12.70 mm plastic, F-shape, cylinder type crystal, Timex® REF 23-927917, fits: 1977 Timex® M-23 Cavatina Models: 517121, 517201, 1976 Timex® M-23 Cavatina Models 517101
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Timex®. Timex® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.