X86-Secret : ES Zone
Pentium III 667 MHz ES  (Week 36, Year 1999)   
Intel Confidential QG41ES - 993680007-0327 MALAY - 80526PZ667256

Build with the new 0.18┬Ám process, the Pentium III 667 was announced in October 1999. At the same date, Intel introduced the Coppermine core and released lots of other clocks speeds like 733EB, 700E, 667EB, 650E, 600E, 550E, 533EB and 500E MHz. This particular engineering sample come with the cA2 stepping and was produced in late August of 99, two months before the official launch.