Your story very much resonated with me.
In the late 1990s, I was living in Washington DC and spent some fun weekends watch-hunting at local flea markets with the former moderator of this very WPS (then Purists) wonderful Omega Forum. I first saw the Omega Marine Chronometer (OMC) on his (large) wrist and was immediately obsessed. "Tell me about THAT!" I'm sure I said. I knew then and there that I'd pursue this model sometime later despite how ridiculous it looked on my much smaller wrist. On me it looked like a house arrest monitoring device.
Thus began the journey. I'd hunt for examples in great shape with original papers. And at that time, you could find these (always from European sellers) for reasonable prices.
The OMCs came in two flavors: The Cal 1511 and the Cal 1516. The former are rarer.
The 1511 had a larger case, which is really obvious from the rear view:
The watch-specific papers came in a brown vinyl folio:

The other variations, with different blue and other dials were Cal 1510, but movement was identical to 1511 I believe. Some had aventurine dials.

Wrist shots -- not for the small-wristed!


Lastly, there's the Cal 1525 desk clock version, made for the French navy and also for civilian use:
