No, the ref. number is not the case number. People here (in the vintage section) use the case number as if it was a reference number, but it's not.
For example the 35705000 Speedy Pro is a case number 1450022 (055ST1450022 to be complete).
Certainly parts are available for these watches, but if you are asking if they are available from Otto Frei, you would have to ask them.
Just a hint - if you give me the reference number of the watch you are wanting parts for, I can tell you the case number...
Cheers, Al
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