Working on my "new to me" house I've come to the floor... it's 80's style parquet, real oak wood.

In some places it looks nice but high traffic areas it's down to only the wood... no seal.

What / how was this parquet originally sealed?

Aside from sanding it ALL, and refinishing it all what can I "rub on" to make it nice(r) again?

We used some 'cleaner with oil' you get at Wal-Mart and it made the nicest parts of the floor nicer but did little to the dull high traffic areas that are only wood.

Suggestions?