Mexican omega 1979 speedmaster with seamaster dial?

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Hello everyone, I need your help. I just came across this Omega Speedmaster, but it has a Seamaster dial. The day and date are in Spanish. The bracelet says "Made in Mexico" from '79. Its movement is original, but I’m confused. I’ve found this watch under the Seamaster line, not Speedmaster. I don’t know what to think. My watchmaker says the movement is genuine and from that era. I hope someone can help me

 
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The dial has been very badly re-painted, thus the confusion.