The type with the brushes are black as has been mentioned .The brush type clutch was used primarily on the York aluminum compressor in 67,68,and 69. The type with the donut shaped electro magnet activated clutch are zinc silver. I haven't seen any Dearborn compressors that were York style compressor that hadn't been a service replacement. The York was a common service replacement compressor . All of the Dearborn units with the Tecumseh assemblyline cast iron compressors that I have seen were of the silver electro magnet activated type. Possibly being a very early 69 production it had the York aluminum compressor with the brush type clutch. I would do some more checking to confirm because Tecumseh was the overwhelming majority at Dearborn in 69 from the evidence I have seen. If it was a 69 Tecumseh compressor it would not typically have a brush activated clutch.