МАУ 46, Russian Empire - An old photo of a man in a military uniform

The Mikhailovskoye artillery school (Saint-Petersburg, Russia)
Русский: Михайловское артиллерийское училище (Санкт-Петербург, Россия)

MAU-46

A close-up shot of a MAU-46 control unit, part of an aircraft system, possibly related to bomb ejection or similar functions.