Hi, thanks, and I did read the label well, german is my mother language
I took the landing gear outside now, cleaned it and hat a look. The "Sleeve" needs to go up, fits perfectly, and now the whole shock absorber is visible.
There seems to be a spot where a "label" must have been, but gone now. Nevertheless I did find some numbers, see pics. No FL number or similar, but maybe this can help somehow?
To the idea that this is from a Fiesler Storch....I had a kool, there are some norweginas who are restoring a Storck, look here:
It looks similar, but different in some details.
Took some more pics outside after first cleaning and numbers, maybe there is a clue in this: