Serial-wise it's not. According to http://myoldmac.net/FAQ/Mac-Serialnumber-decoder-e.php

"Your Macintosh 512Ke was the 279th Mac manufactured during the 49th week of 1986 in Fremont, California, USA."

The logic board is an 820-0086F marked on the both sides (faintly under the numbers where the memory is and on the back). The cool part is that in dim light, the board writing looks white. I checked if it was "glow in the dark".. It's not