Spotted on eBay, a purported prototype of a 13-inch MacBook Pro according to the seller. The photos and comments aren’t very explicit.
This prototype !!! This is a modified version of the model A1278. Used for testing. A distinctive feature is the modified audio system. Chip processor memory. Other security protocols. The layout of the laptop is different from the original. Laptop assembled by hand. This is a prototype. Working version. Starts and runs.
I admit the explanation about the audio system is peculiar, for instance.