Is this a 'Ranchero' or a 'Seachero'

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Hi folks,

I came across this watch on sale which is stated as Ranchero 2990-1.
I did some research on the 2990-1 and came to realize that maybe the dial on this watch could be a Seachero 2937-3 instead?
So how about the case? Could it be a 2990-1 case with a swapped dial? Or could it be truly a rare Ranchero 2990-1 just as how the seller explains in their website.

Along side, the case of the watch is engraved as 2990-1. I find it interesting and would like to have some advises from the experts in this forum.

Thank you.
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