You are buying 1 part of the  Mostek Z80 Ceramic CPU 5Mhz Engineering Samples late 1970's 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 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.