What's this code to identify a macbook? (example: A1278)

rodion15

Distinguished
Sep 11, 2011
64
0
18,590
When I look for parts for a MacBook in ebay etc, I offend find this codes, what are they? I don't see anything similar in macs labels nor Apple websites.

example: A1278.

Another example: Apple Macbook Air A1370 Bottom Case Screw Set

That "A1370" is neither a serial number nor a part number, what's it?



Thank you