TOPCON 1957 the first SLR film camera that the company made with original lenses, note the over engineeered lens shutter.

I was pleased to find on a visit to a UK hospital that the Topcon Japan company still make Optical equipment. This is a very heavy camera which works well without electronics. I have read that this 1957 was the first SLR made by the company. It also had two choices of viewfinder, a waist level and a normal viewfinder.