Yes I'm certain that's the case. My Dad had the watch way back when I was kid in the late 60's and early 70's. The red box with the papers was always on the bedside table and I can't remember him ever talking about replacing the mechanism. That would have been a big deal in our family.

Thankyou for taking the time to add your thoughts.

 

Just got my extract last week.

hefty sum, but nice to have.