As cb400bill said, there's a separate sub-forum for appraisals. If you continue here the thread will be moved there anyway, so it's best to just start a thread there.

To get a reasonable estimate you'll need to post good quality pictures of the bike with the drive side facing the camera. You can add pictures by clicking the "Go Advanced" button and then clicking on the icon that looks like a yellow square with a mountain in it. Alternatively, if you have the picture on a site like Imgur or Flickr, you can post enough of a link for someone to find it (you can't post a working link until you have 10 posts) and someone will help you out by sharing it on your thread with a proper embedded image.

Ishiwata 022 tubing indicates that it's a late 70's or early 80's entry level model, but all Treks from that period were very good. The value will vary a lot depending on the condition of the bike but also your location, so be sure to share that information too if you want an accurate estimate.


Edit: Somehow I overlooked wildwood's post, which is why I repeated so much of what he said. Oops. What I said about attaching a picture might be wrong. If it is, do what he said.