Initially I thought I had a wrong crown on my new purchase of the "Nina tricompax". Then I compared with my Tricompax exotic dial.

The pushers on my Nina tricompax is shorter and smaller. The crown is also flatter and of a different logo versus my Tricompax exotic.

Now I am very convinced after searching for similar examples.

My Nina tricompax serial is 237xxxx similar to another exact example.

Also, interestingly, the month and day disc wheel are in black writing versus the later executions in red.

I believe the black writings are MKI. In fact the bezel print is of a fat font versus the MKII of my exotic dial.

Here's photos.

 

Here's another MKI example: http://www.rolexforums.com/showthread.php?t=425916

 

And check out the fat font insert.

Definitely much fatter.