But I am a little confused about the Flying Minute Tourbillon as I noticed they looked different in the two watches and having read your great and informative post discovered that the Big Pilot's Watch Perpetual Calendar Tourbillon consists of 85 parts and weighs 0.635 grams whilst in the Big Pilots Watch 43 Tourbillon it consists of just 56 parts yet weighs the same 0.635 grams. Whilst I have to admit to not knowing a lot about Flying Minute Tourbillons I can't really understand why the same complication in two watches would require a different number of parts but yet still weigh the same, Enquiring minds need to know if possible.