X86-Secret : ES Zone
K5 133 MHz ES  (Week 35, Year 1996)   
AMD-K5-PR133ABQ / B J635560 ES / 1996 AMD / 66MHz Bus 3.52V

Here is an engineering sample of the AMD K5, released in 1996. This CPU was the 5th generation of AMD CPU. This sample features a 66 MHz FSB, 16 KB of L1 cache and an effective built-in FPU. The AMD K5 was not a great success in the industry because of the delay. So, engineering sample are rare piece of history.