Canon F-1 Instructions Manual page 21

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Setting the Film Speed
When loading the film, be sure to set the film speed scale
at the proper position.
Repacking a Bulk-Loaded Film
If you are using film that has not been wound
commercially, be sure to trim the tip of the lead
between perforations.
Memo Holder
The memo holder on the camera's back cover is useful
for keeping data like film speed, location, shooting. For
example, after tearing off the end of the film box which
specifies the type of the film being used, it can be
inserted into the memo holder as a constant reminder.
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