83 and 84 are the years for the blue atc110. They are less common than the red 110s, but far more common than the christmas edition atc70. Without pictures it's hard to tell the value. It is hard to get the blue honda plastics though. The value is really what someone is willing to pay and with people money being a little tight right now, it's probably worth less now than it would have been last year. Some people say the blue 110 is worth the same as the red, but if someone is looking for a blue 110 and they find what they consider to be a nice example, they will more often than not pay a little extra for the blue atc110. But it really depends on the person and the trikes condition. Good luck with your buy.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90