Tesla serial numbers are 11 digits and alphanumeric, and are often found affixed to Tesla products via a label or engraving.

Using the above serial number (T12J000683) as an example, Tesla serial numbers can be decoded in the following way:

Digit 1

Manufacturer
T = Tesla

Digits 2-3

Year of Manufacture
12 = (2012, 2013, etc.)

Digit 4

Month of Manufacture
J = (A is January, B is February, etc.)

Digits 5-11

Production Number
000683 = (000683 is the 683rd part with that part number)

Therefore, T12J000683 was manufactured by Tesla in October, 2012 and was the 683rd part with that part number.