I personally prefer MM as it seem to describe the curves and lines on this magnificent watch.
I finally found the final piece for my 9-90 collection.(Thanks Roni and Alex)
Here are some pics-
I have also included all my pieces but not in one picture as I do have access to all the pieces currently. Will try and get a family portrait in the future.

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The obligatory wrist shot
The collection
ref 425 aka Tegolino (Does anyone here know where the term comes from?)
ref 2554 aka Manta Ray
ref 1593 aka hour glass an the ref 5500 aka Pagoda( a reedition of the original Eiffel Tower ref 2551)-obviously thr Pagoda does not have the 9-90 movement.
What I find amazing is that only 150 of the 2442 were made but they seem to be quite prevelant in the auction houses. For such a rare watch I seem to see them quite often .
Any way I think this is my final purchase. How many is too many? When I feel the collection feels complete. So no more....although thereĀ is pg ref 1593 which would complete the perfect trifecta.
Julian