So - I feel very lucky to own this watch (picture below). I bought it many years ago.
It's the exact same watch (not a similar watch - but the very same) used as the 'B sample' in the 'On The Dash' examples of 1940's to 1950's Moon phase, triple date chrono's.
As you can see, it's quite different to the other examples, which have the pronounced 'advance' buttons at 8 o'clock and 10 o'clock. The dial is also more 'simplified' particularly on sub dials.
Mine is 18kt gold and in pristine condition.
As a matter of interest, any expert ideas on current value ?