

Google " Master moon platinum ", you will see several with the blue date windows, like yours.
So it seems that both configurations exist.
It also features in your configuration, with the platinum oscillating weight, on the 2000 / 2001 JLC Catalog, page 179.
Why?
I don't really know, Ken.
Will try to ask to the Manufacture, but they look very busy, at this time, as the SIHH is approaching ...
Best,
Nicolas.
The Mastermoon, and particularly this version (regardless of the variations you have cited), remains on my wish list. I hope it is true that there ars some minor variations even in such a limited edition as this. Those minor variations make collecting more interesting, albeit often frustrating, and they also make your example all the more special.
Thanks for the photos of the MM. I think this might be the watch for which I would ultimately break my 38mm barrier. LOL.
Best,
respo