X86-Secret : ES Zone
Am486 SX2-50 ES  (Week 52, Year 1993)   
A80486SX2-50 D AMD ES (24361)

The earliest sample known of the clock-doubled 486 clone from AMD. The 486 SX-2 50 didn't include an FPU and was clocked at a board speed of 25 Mhz. In opposite to the others engineering-samples, this particular sample come with no numbers in the top side. Produced in late 1993, the final revision of this CPU was announced in September '94.