The earliest use of a lot number started in 1964, and is read quite differently than the second and third type codes. As far as I’m aware of, revision number “07” is the largest number carried throughout the 1970’s for an Ambassadeur reel and was issued to model 6000. If you can not, it’s definitely a serial number. Using the 3 types of date codes below, see if you can make the first two group of numbers represent a year AND a month. As an example, lets use a known lot number of 73 09 02 or a random serial number of 71 13 09. If you’re not sure the frame is stamped with a serial number or lot number, try breaking down your reel’s 6 digit number into 3 groups of 2 numbers each. Identical lot numbers can be found on many reels within a given model. They were used from mid 1964 into the 1980s. There are three types of lot number arrangements used to identify the month and year a reel was mfg 'd.
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