Railway train car number sign 4 - Russian vintage number plaque white black

Enamel metal number plate Four 4.
New. Storage stock. Vintage.

Size is 20 x 12 cm.
Weight is 230 g.

Apparently it was intended to be used as a car number plate in the train or possibly in some other way on the railway lines of communication. But really it can be used as a street  address sign house number.