I think the reason that STS don't want to do it is as given by Al, above. It's a "return to base" calibre so has to go back to Bienne.
You don't need a parts watch and often, all the parts worn out on one watch will be worn out on the parts watch you have as well. As I said above, most of the movement parts seem to be available so, I just briefly scanned some suppliers and at first glance, virtually everything in the mechanical side is available except for the plate, bridge and date guard. Crown pushers etc all seem to be listed as well. But, I'm still assuming your case is 196.0052 in stainless and it will then hold a cal 1611 as you haven't said what it is.
Good luck with it.
Regards, Chris
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