I was recently cleaning out some kitchen cabinets in my parents house, and discovered a King Kong lunch box with matching thermos as well...that would date back to around 1977 I think. I looked around online a bit and saw some similar valued at about $95. I don't know if anybody would pay that much. I also discovered an ole Lone Ranger jelly jar that's supposed to be worth a lot of money too. I bookmarked the sites where I found some info...but now I can't find the bookmark. Maybe there is somebody here that will know where to find info on this type of thing.
John