X86-Secret : ES Zone
Pentium II 266 MHz ES  (Week 04, Year 1997)   
DC80522PX266512 Q097 / Z7040070-068 A4
DC80522PX266512 Q089 / Z7050130-004 (M)(C) '96

Two nice early engineering samples of the Pentium II. Both were built on the Klamath core (0.35 ┬Ám) with 512 KB L2 Cache off-chip. They were clocked at 266 MHz without ECC correction for L2. The first Sample was built in January 1997, 3 months before the official introduction, the second, one month later. You can notice the unusual top INTEL marking on the second sample.