Which Strida is it?

Ah, I see, that’s great!
You must know; many new owners appear here wishing to repair and ride their bikes.
And mostly they’re disappointed in the end I believe.

Btw, there’s another MK1 fan in Vienna, he can be found also here at the forum:
MK1 professional restore? (steering)

And here’s the manual:
https://issuu.com/mark77a/docs/strida1-owners-manual