I have one of similar ilk, East German(exactly the same label), makers mark "BM", all wooden construction including levers and pads, brass reeds mounted on aluminium plates, two reeds per note, card/paper/leather corner bellows, scales "G" and "D". They certainly don`t come any more economically made than these. My late brother bought it for me at a house sale in Sussex somewhere. Not an unreasonable tone and it serves a purpose.