Marty, I think I have an idea but I want to make sure. Somewhere I have a tag that I know the build date of the car it came off for comparison. Should be able to decipher. Later Yorks used to contain model year in serial # but I think that wasn't till the 70s. Being a C8 compressor I feel it is most likely a 68 model year date as it was replaced by a C9 the following year