I have seen the Canon High Speed F1 and the Nikon F2 side by side on a bench in the lab I worked in about 20 years ago.
Two photographers, one from the USA and one from Germany were both in the lab at the same time getting their E6 films clip tested.
They were both going to NZ for a sporting event after having been in Oz for something sporting. Both of them had borrowed their respective high speed cameras from Canon and Nikon. Both ran pellicle mirrors, both chewed batteries at an alarming rate as well as film. Both of the photographers had about 400 rolls of film each to be developed.
Both of these cameras were about the same height, which was around 240-250mm high and they were very heavy. Both had more dials on the drives, than a jumbo jet cockpit.
Both of these cameras are physically big and really heavy.
The Canon which was being used by the American was attached to a 600 f4 (or thereabouts) lens, He had a huge surveyors type tripod with a fluid head attached and the whole kit and caboodle weighed about 30kg.
I have never seen or heard of a smallish high speed Canon, doesn't mean they don't exist, so it may be a one off build.
Could be a very interesting camera to own, expensive for film if you leave the finger down for about 2.5 seconds, but it would be fun.
Mick.