100% genuine OEM Omega part. This part is now Exchange-only from Omega so very hard to get.

Case back is loose, opened, no packaging included. Looks unused but I am sure there are micro-scratches from storage so selling as used. 

See pictures for full details, they are better than my eyes and are the best description. 

Please ask any & all questions before purchase, thank you. 

Yes, this fits any standard Speedmaster Professional case for the 861 or 1861 movement. The full range of 145.022, 3570.50, 3590.50 etc. No, it does not fit a Speedmaster Reduced or any automatic Speedmaster. Please make sure this will fit your model before purchase.