[jay72]

The York compressors were on the 1979 930 up to around vin 1000 give or take. The Nippondenso came after that. There were changes during the 1979 model year such as the headlight washers, headlight adjustment bezels, radio knobs, speedometers, sport seat changes, a/c vents and a/c compressors. There are numerous threads on this. The later '79 cars got the changes that the 1980 models had and the A/C compressor was one of them. A car with a build date of 12/79 is very late and I have only seen three or four others. Two paint to sample cars with vins in the low 1150's and a red car with vin in the low 1100 range.