This is a NOS throttle body. It is 60 mm. It is the original one that came with 87-93 Mustang H.O. engines, but the tag is E3ZE-BA so it would be original with a 1993 H.O. Mustang. It would be numbers correct is you were restoring a 1993 Mustang for show.  I bought this 10 years ago for a project and never installed it. I do not have the box. I have not seen many brand new ones recently.