MacBook Pro 13", A1278, Mid 2012, MD101LL/A, MD102/LL/A, Board#820-3115-A, 820-3115-B

This is the final form-factor of the 13" Pro non-retina MacBook.  It is significant in that it is the last 13" MacBook to have upgradeable RAM and hard drive.  It will also work with OS 10.14 Mojave, whereas previous years will only go as high as High Sierra.  The MD101LL/A has a 2.5GHZ i5 processor, whereas the MD102LL/A has a 2.9GHZ i7 processor.