Pops had this in a clear sealed bag in his desk with a tag on it, so I will do my best to describe this part. Part number 1116378 comes back as a voltage regulator for transistor ignition w/AC. It was used on GTO, Corvette, Camaro, Nova, and Oldsmobile from 65-68. This looks NOS but has no date or part # on the unit. The prongs are clean and no surface rust anywhere with DELCO-REMY embossed. I am only going by the hand written tag he wrote. It is a very clean unit and not sure how long he had it. He offend liked to buy things at shows thinking he might need it someday. He had a '64 Vette so not sure why he had this.