Bulova 1961 Royal Clipper

Digging thru my pile of parts watches I found this 1961 Royal Clipper that had a severely rusted tension ring.  I had previously tried to work on it but but could not get it out of the case. I finally gave it another try and was able to get the movement out.   I was able to remove a whole bunch of rust dust from the movement.   After a service, polish and relume of the hands it turns out it is running quite well.  

This appears to be a 1961 Royal Clipper with a 10KT Yellow RGP case and case back.   The back has a M1 date code.  The movement is a 11ANAC 17J with a M0 date code.