If you can take a better photo of the panel below the monitor I will likely be able to tell you. It looks from here there are some orange buttons on it which is a giveaway that it's Heidenhain, I can tell you more from a better photo.
Best picture he could provide me with his potato phone. Does look like a Heidenhain, although a few machines of this vintage that were assembled here in Brazil had a controller branded "DIADUR" with the same general layout.
That is usually the case with these older machines, most manuals are in English and few of the older generations bothered to learn it so they usually toss the manuals aside and over time they get misplaced.
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