The short answer to OP question is no - there is no way to find out where parts and labor originate for vast majority of "swiss made" watches. For one, those that do rely on Asian labor and part sources, are not keen to advertise that fact. Currently "Swiss Made" allows companies to charge a premium price, but I expect that vale to deteriorate over-time. Fact is you can get better made Asian watches (from Seiko to Seagull) that some of the so called "Swiss" ones.
To a degree, you can use brands' pedigree, reputation and pricing as some indicator of part\labor sourcing. While this is not based on facts, I'd bet good money that most brands I can tell about origins w relative accuracy:
- 95%+ or close to it Swiss - Rolex, PP, AP, VC, Breguet, Zenith, JLC, Omega, Breitling, Longines, etc. (granted many of these may use China to source cases, dials, crystal, etc.)
- mostly Swiss but with a healthy doze of Chinese involvement - mid-tiers like Hamilton, Oris, Tissot, Raymond Weil, etc
- Mostly Asian sourced except movement, final assembly and perhaps one part to get to 60% of value - all low-end, so called "Swiss Made" watches - Stuhrling, ROtary, Invicta, etc...
If you check FH requirements for "Swiss Made" (
FH - Swiss made: the only true reference), there is a dozen loopholes one can exploit to get it the label with minimal Swiss involvement.
I think "Swiss Made" is over-rated and largely meaningless. I mean - Lange is made in Germany and is arguably on par w holy-trinity of Swiss makers. Glashutte Original and Nomos are German brands that blow-out comparably prices Swiss competitors. Panerai is "Swiss Made" but is an Italian brand.
Honestly, I'd take a nice Seagull sporting "Made in CHina" proudly over virtually any sub $500 Swiss made BS (like Rotary or Stuhrling Original), and would take nicer Seiko (JDMs) over many entry-luxury Swiss brands