X86-Secret : ES Zone
ODP486DX-33 MS  (ODP486DX-33 MS)   
ODP486DX-33 - MECH SAMPLES - C3430344 - (m)(c)'89,'90

The ODP486DX-33 was one of the very first-gen Intel Overdrive. Installed into an Overdrive Socket, it replaces the original 486 DX-33 for a clock-doubled 486 DX2-66. This mechanical sample is probably a non-functioning sample without any die inside.