Here is an early Canon advertisement for its F-1 (and others).

The Canon F-1 was first released in the US in March 1971. Some cameras were produced as early as September 1970 to meet the release date. If you find an F-1 with a very low serial number (less than 1000), it could have been made in 1970. The internal date code would carry a ‘K’ as its first letter (K=1970).

My earliest F-1 is from mid-1971.

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