X86-Secret : ES Zone
Intel C8086  (Week 22, Year 1978)   
C8086 S2804 4967B INTEL'78

Intel announced its first 16 bit microprocessor in April 1978. Production started in May and the 8086 was officially released on June 8. This CPU is very special : it's the world's oldest known production Intel 8086. The date code printed on the back shows that it has been produced in May 1978!