That's not a bad looking D6. The CCU is a #25 Cat unit. Based on the spoked front idler I'd say it probably is an early model (dry clutch). Does appear that the tracks are at/near or past adjustment range. Most parts are still available new or used. Tracks are still available either original pitch or later 6.9" pitch conversion.
Don't believe you'd have a problem selling for that price on the west coast as they are a popular model.