Topcon made a series of 35mm cameras that were worthy competitors for the Nikon F, and was either the first or second (depending upon whom you believe) to offer TTL metering. They were imported, at least for a time, by the Beseler Company. Their top-of-the-line, the Super D, was the official camera of the U.S. Navy around the late 60s--early 70s. They also made the Primo Jr. 127 TLR, which was also sold as the Sawyers Mk. IV.