This
slightly updated version of the original F-1 is easy to identify with a
film speed holder on the back (remember taking the flap off the box of
film?) and a plastic tip on the redesigned film advance lever. 13 small
improvements were made but essentially it is the same camera as the
1971 version. Called the F-1n to distinguish it from earlier F-1's and
the later New F-1 (or F-1N). This example has the Canon Motor Drive
unit MF installed with a firing rate of 3 fps, not the fastest but
reliable enough.