Vintage Polar Planimeter - Gebr. Wichmann m.b.H. Berlin
Serial number is 8158. Made in Germany.
Used to calculate irregular areas (on maps, for example).
Comes in original wooden box. Seems to be in fully working condition - all parts are moving, and all slots are filled with corresponding items.
This item was used in some Russian institution since there is a brief datasheet included in Russian.
The planimeter has # 8158 on it, but the box has # 1192. Not sure if both are serials - may be one of the number is the instrument code.