Title says it all. Are the 145.012 and 145.022 Case backs the same except for the engraving? Can I use the 145.012 case back on a 145.022 case with an 861 movement?
If it's anything like Seamaster chronographs - yes, you can interchange them. The different digit referred to the caliber 321 or 861 inside. Wait for more informed opinions from the Speedy guys though.
Thank gentleman. I was just not sure since I think the back and the cover hold the movement in place and didn't know if there was a difference in thickness between the 321 and 861.