The brass valves make it either Japanese or Korean, probably from the mid-late 1970s. The manufacturer's data would have been printed on the flap of a little accessory pouch that was attached on the inboard side of the tube, beneath the oarlock. These were made in the days when manufacturers still considered the BIA ratings essential, and it would have been rated as a "two-man" raft.
I built a frame and 5-foot oars for one such raft back in 1984, and my kids learned rowing technique. This photo was taken at the launch site for a John Day trip from Clarno to Cottonwood on the John Day River.