X86-Secret : ES Zone
Pentium II 350 MHz ES  (Week 03, Year 1998)   
INTEL CONFIDENTIAL / Q309 ES / Q433 ES / Q559 ES

Some samples of the Pentium II 350 Engineering Sample. Build on the Deschutes core and featuring 512 KB of L2 cache, the PII 350 was one of the first Deschutes produced. Here is three engineering sample produced on the life timeline of this product. Here is a Q3xx stepping (the earlier), a Q4xx and a Q5xx, a late sample.