Updated new last photo showing the inside photo's that these are MK 3880 or Z80 parts, had to de-lid one and use digital microscope for this. You are buying 1 part of the  Mostek Z80 gold processor Engineering Samples late 1970's Gold and Gray NICE! I got these from a former MOSTEK employee that worked there in the 70's - 80's, these are UN Marked New Old Stock Engineering Samples, never used, I bought a whole cabinet of various Mostek parts, great Item for the Mostek collector. 40 pins and Gold / Gray purple color. The white sticker that is on the part was put by the Mostek person some 40 years ago, it should come off with a little alcohol, but parts are in MINT condition. Lets make a deal.