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Saw this and hadn't ever seen one before, wasn't even sure if it were original at first until it turned out its actually a real reference, with the same metallic electric blue dial colour as the Seamaster Pro 300M with sword hands, but with a square waffle dial pattern similar to @kyle L's vintage Seamaster.

The pictures aren't amazing but here's another shot of the same model with a better look at the dial:



Still no idea what the reference is but damn that's a pretty dial in that colour and pattern!

 

What reference is this? Looks like a franken with a Dynamic case...

 

That was my first reaction too but apparently it was a Japanese market LE, there's a black dial version too along with a half dozen other rare Japanese Dynamic versions

This one's almost a pseudo-military version, Ref is 5202.51

 

Some more pics of the electric blue version:



Its almost an evolutionary stepping stone to this electric blue Seamaster 120M

 

@kyle L Here's the black dial, almost the same as your Seamaster, found the reference, its 5203.51, not sure on the blue dial version's reference yet though

 

Found it Blue dial is Ref # 5203.81

 

Omega Nipple Dynamic Ref # 5203.80 - interesting in that it has applied dial indices prior to the Seamaster getting them

 

Dynamic Silver dial (still Japanese LE) Ref 5203.30:

 

Ah! Found the 5203.20, its a white dial

 

5203.350 is the last reference, no idea where I can even find that one, its odd in that its a 3 digit second block not a two digit, but Omega lists it as a valid reference on their bracelets and end links.

Always amazes me that there's so much out there I've never even head of after all this time. That and nearly all of these were impossible to find without going through Japanese websites, and even then only 1-3 watches could be found of each example.

 

Very weird models!

 

The Speedmasters limited to Japan is a huge list as there's also the Mitsukoshi panda dial and at least a dozen reduced, MK40 and Date models alone.

Then there are other rarities like the ridiculously cool 18K solid gold perpetual calendar moon phase calendar that @Shem has and the gorgeous 18K Golden Panda @Kringkily has:

https://omegaforums.net/threads/unicorns-do-exist-gold-panda-is-well-alive.26098/

There's probably even more cool stuff over there none of us have even seen before, amazes me every time new cool stuff pops up like that.