Help for speedmaster moonwatch insert identification

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Hello,

this insert in the photo leaves me puzzled; it resembles a DON without being exactly what one would normally expect.

There's an accent on the "e" in "Tachymetre".

The "7" in "70" is a serif, but the dot is really low.

The "90" dot is on the side at the top; usually it's much higher and above that, but DNNs are normally lower.

The condition appears genuinely old; it's not a recently applied patina. There's a layer of grime on it, inside the bezel, and everywhere else on the watch that I was able to examine.