Archer
··Omega Qualified WatchmakerCan you imagine sending in your old 1861 speedmaster to Omega for service in the next couple of months. If the caseback is damaged enough for them to want to replace it, you just might get the latest & greatest caseback with the returned watch. Not sure but after a while they will stop producing the caseback with the "old" engraving.
If past history is any indication, you won't have to worry about such a thing for a couple of decades at the very least...