Hello Dembones
Yes, if the engine is original we're talking a mid 1980's ride-on.

Note that one image says this mower has a three speed trans-axle ...
meaning a 3 speed box with a Hi-low range [all in an axle mounted box].
It may have also had a differential in that same box.

This screams USA to me. But what brand! mad

I hope a member can identify what has happened here.

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Jack