Intel 86/12 CPU boards. UPdated NOv 18 2016 
socketed 8086, 8202 grey ceramic

In paired photos, board on top is:
pcb 1001802-02 rev  A; various ECO's; "whitewires"
SBC 86/ ; PWA 1001801-21 rev E 
chip datecodes early to mid 1978
missing PROMS E67 E68, socketed

ECO 23117; ECO 2-2998; 2-2776; 2-2455;

board on bottom is:
pcb 1001802-06 rev G; few whitewires
SN 105056; iSBC 86/12A, PWA 100 ME rev T; 1003052-08
chip datecodes early 1980
A67  and A68 are N82S127F Signetics, socketed