The next two digits indicate the week of the year of production. In 19, a number of Macs were made at Fremont with "F1" or "F3" as the factory designator, and modern build-to-order Macs may have a number preceding the letter in the factory code. Referring back to our example again, we see that the Mac with serial number F 4 412SAM0001 was made in 198 4. In all cases prior to the Mac Plus, this will be in the 1980s. The first numerical character* indicates the last digit of the year of production. In our example serial number, F 4412SAM0001, we see that the Mac in question was made in Fremont, California. The prefix consists of one or two letters (and/or numbers) designating a factory code: The methodology behind this decoder is reasonably simple. WARNING: Geek alert! If you don't like math, you can skip this section.
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