Otawa Optical Co. Middl Flex
Otawa seems to have led a brief and low-impact life in 1952-3, credited with just two models in the literature - a 120 folder and the Middl Flex. The latter apparently appeared in some variant guises - whilst the specification doesn't vary, the one in Sugiyama has a cosmetically different lens surround from mine, sporting a truncated-squared-off ovoid shape around the viewing lens.
Any further information gratefully received.
Taking lens is VERY Anastigmat 80mm f3.5
Shutter Middl 1 to 1/200