I suppose it is plate from some clock or another device, maybe Imperial's or first Republic's time. What do you know about that?

This plate could be from anything that Christian Rotermann manufactures.

http://et.wikipedia.org/wiki/Christian_ ... _Rotermann

What's the plate measures?

Oh, I couldn't suppose "Chr" might be "Christian" Thank you very much!
Size is 7x3 cm.

Venepoeg kirjutas: Size is 7x3 cm.

I suppose that plate is from some machinery they produced.

BTW, search for "rotermann quarter tallinn" and you can see into what
all those old warehouses and factories are turned today.

Thank you! I see it everyday

funker kirjutas: I suppose that plate is from some machinery they produced.

Not necessarily produced. This plate may have been on somethig they sold too (as a dealership plate).