Bugging me: Speedmaster precursor

Sorry to clog up these hallowed pages but this is really bugging me and I figured if anyone knew it would be you lot.

So: I saw a watch (made by whom? I can't remember and that's the problem) that, iirc, pre-dates the Speedmaster but which had almost identical dial layout, including the dot-dash-dot at 12 o'clock. Basically making the Speedy a copy of an earlier design.

Iirc it's a mid-1950s chronograph, NOT by Omega and presumably powered by a Lemania (2310?). However the exact make and model is eluding me.

Whether that watch was also designed by Claude Baillod I do not know.

10p to the first member who can tell me the watch I'm trying to remember!

THANK YOU! Where do I send my florin?

Never heard about this watch. Very interesting article. Thank you for your knowldge 😀

These look so cool and always love seeing the smaller houses get the attention they deserve.
https://www.visionvintagewatches.com/product-page/1954-rodania-geometer-chronograph-5621h