The Caliber 501 is a beautiful movement that’s regarded as among Omega’s significant movements including an example on permanent display in its own factory museum in Bienne. - Caliber 501, 20 Jewels (SN 1,518,6XX) - Beautiful black dial with gold indexes and Arabic 3, 6, 9. - Very nice stainless steel case - Very clean caseback with engraving "WATERPROOF" and "SEAMASTER" - Original clover crown - Movement cleaned and serviced 4 years ago, worn sparingly and runs well - Comes with Omega black matte alligator strap and Omega Buckle Asking $900 includes shipping CONUS (If PayPal, please add 3%) Positive references and feedback available Thanks for the consideration.