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3573.50 I believe is the correct ref#

: with transparent case back. Am I correct that the reference number
: is 3570.50? Anyone with specific information on this particular
: model with the transparent case back would be appreciated. It
: will be joining my stable of a Speedmaster Pro Moon and a Moon
: to Mars. Now I'll be able to see the 1861(?) movement.
: Thanks in advance.

No, you are not correct. The 3570.50 is the standard moon watch without transparent caseback. Caliber is #1861. If you purchased a watch with ref#3570.50 with a transparent caseback, then someone modified it with the different caseback.

-The 3572.50 is the ref# for the hesalite crystal with see through sapphire caseback and caliber 1863(I believe this has been discontinued by Omega).

-The 3573.50 is the ref# for the sapphire crystal/sapphire caseback, more commonly known as the "sapphire sandwich", also with caliber 1863.

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