This weeks camera is:
The Gelmer shutter is known on the Semi Shiks by Kigawa and Roll Light Ref by Ōhashi. It gives T, B, 150, 100, 50, 25 speeds. The shutter plate is inscribed GELMER at the top and GELMER Mfr. at the bottom, perhaps for Gelmer Manufacturing. The speeds are sometimes inscribed on the shutter plate and sometimes engraved on the shutter rim.