That rod is worth $20 but since I am a giving type I would like to offer you $50.
I am not much of an expert on bamboo or anything for that matter.
There is a board that specializes in bamboo fly rods and those guys have books and such and can usually tell you anything you want to know about the rod you have even where and when it was made and by whom. Sometimes even the very day it was finalized.
Good luck and this might be a reason to pick up flyfishing. It is sort of like crack. One trip out on the river and you are going to be hooked.