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: Omega's website indicates that the "Moon
: Watch" 3570.50 has movement 1861, while
: the sapphire crystal version model 3573.50
: has movement 1863. I'm not sure if these are
: the same movements by different names or if
: they are truly different.
Correspondence from a long-time Omega employee as posted on Chuck Maddox's website (a fantastic resource by theway):
" For your information, the " nylon " part , is not made of such but is a very special synthetic material, allowing to preserve the edges of the tooth of a very fine wheel, when returning the chronograph hand to the point " zero " , i.e. this part is having the function of a " brake " ! Several years ago, this part was made of steel, though showing little danger of wear-out but still, we wanted to improve to the best possible quality the performance of our " Moon watch " movement and this is why, the steel part was exchanged for a new " synthetic " material " !
Therefore, all movements of caliber 861 or the newer caliber 1861 ( rhodium plated ) are having this " brake " part in synthetic material, while the " de luxe " movement of caliber 1863 ( for the sapphire case back watches ) is having this "brake " again in steel ( since 1980 ) to preserve the " optical aspect "
best regards John R. Diethelm. "
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