Two eBay vendors have told me they are not interchangeable so I guess that is the answer.   

Wives always think we have problems. Welcome. 

Pictures  would help..most likely  it is a snap  on back which you pry off.most likely  the rotor is loose  or severely  worn. Others may know better, but you probably  could just remove the rotor and use the  watch as manual  wind only. Other possibilities  include  a donor  watch to swap movement  or get parts. 

Hi, I guess I’m a watch collector. My wife thinks I may have a problem. Anyway I want to learn how to do some minor repairs and maintenance. I just happened on this form and am excited about it. I’ll go over the rules and be a great member. I live in Bessemer Alabama and work as a registered nurse. 

the watch was serviced, not manually wound then purposely not worn overnight to check the wind down time, so if you ask me habits did change esp since he was sick and was not moving much. Now if he manually wound it and it did not run overnight then i would say without a doubt there is an issue with the service. I don’t think its wise to just automatically jump to service as the culprit, I like to give the professionals the benefit of the doubt.   BTW Bauertime sorry for your loss - you will be in my prayers tonight