Good day I am sorry if this has been asked before. I tried to find information without prevail. Are the microtors from different calibers interchangeable? And parts in general. I am looking for a movement to give one of my PR new life. It is a 215. And I often find 218 near mint movements on sale at ebay. Thanks for any insight. Happy holidays!
215-x and 218-x calibers all share the same rotor. 68, 69, and 1-69 will interchange with them, but are different designs.
You can switch the whole microrotor system. Even a 69 (ball bearing) to a 215. In your case a 218 and a 215 share the same microrotor system as @CafeRacer answered