Please ensure you read the full. Omega Silver 0.800 Pocket Watch Case 1900, 51.4mm Engraved Repair Parts (623). The case is marked: 1950108. Diameter of the case: 51.4 mm. Diameter of the caseback: 50.08mm. Diameter of the inner front part of the case: 43.38mm. Diameter of the inner back part of the case: 41.13mm. Diameter of the crown: 9.12mm. The metal is 80% pure silver (0.800 silver purity mark). There is no upper ring which holds the crystal. The case has some spots on it. The dial has chips and scratches. The functionality and service history are unknown. All my items require servicing by a watchmaker. Please carefully review the photos to evaluate the condition and design of the case. Normal: up to 30 days to arrive at the destination. (Note: Mexico, Brazil, and Italy may take longer). Special: up to 45 days to arrive at the destination. If you have any questions or concerns about your order, please contact me, and I will do my best to assist you!