I cant post pictures until I have 10 posts. The picture of exact model is on google [Author Horizon 2005]
kolo.cz clanek author-horizon-2005

Thank you very much for information. I'm going to convert this bike into ebike with kit. It has fork from unknown mtb without front brake. I just need to travel 2km to work. I can use it as it is.

The only part that Im unclear is wheel size, ebike company sells 26'' and 700c (28'') without tire.
26'' they say is 571.5mm and 28'' 634.5mm.
571.5mm is 22.5''.
634.5mm is 25''.

Which of these would fit on my bike ?