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Apple devices manufactured after 2010 generally have **12-character alphanumeric** serial numbers, with the **first three digits representing the manufacturing location**, the following **two** indicating the **year** and **week** of manufacture, the next **three** digits providing a **unique****identifier**, and the **last****four** digits representing the **model number**.
The fifth character represent the week in which the device was manufactured. There are 28 possible characters in this spot: **the digits 1-9 are used to represent the first through ninth weeks**, and the **characters C through Y**, **excluding** the vowels A, E, I, O, and U, and the letter S, represent the **tenth through twenty-seventh weeks**. For devices manufactured in the **second half of the year, add 26** to the number represented by the fifth character of the serial number. For example, a product with a serial number whose fourth and fifth digits are “JH” was manufactured in the 40th week of 2012.
The next three digits are an identifier code which **serves to differentiate each Apple device of the same model** which is manufactured in the same location and during the same week of the same year, ensuring that each device has a different serial number.
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