Good Day All. I need your expert opinions. I have two 1984 (M) Miyata bicycles I purchased new many years ago in 1984, and they are both in extremely good condition, other than needing full maintenance and new tires since they have not been ridden in 30 years. Always kept indoors. Now that I have decided to sell them, I would like to get your opinions on their value. One is a Miyata 710 (Serial number M598008) in a Sandstone color, and the other is a Miyata 610 (Serial number begins with an M, but the rest is covered by a cable guide) in a brown metallic color. The 710 is all original, and the only thing not original on the 610 is the handlebar wrap. Thank you very much for your responses. Ride safely.