1980’s Mariner III in two rectangular versions?

This is about the ref ST 396.0986 rectangular 'Mariner III' in the Omega database:
Vintage Watch: Seamaster Mariner III ST 396.0986 | OMEGA US® (omegawatches.com)

Omega shows its indices in a circle:

I recently bought one whose indices are in a rectangle. But it seems that the case is also different:

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1980's Mariner III in two rectangular versions?