If you haven't already done so, search for "Challenge Cutlery" on this website (see Quick links at top left). You will find a good bit of info, such as this exchange: https://www.allaboutpocketknives.com/knife_forum/viewtopic.php?t=17816
Also, there are four Challenge knives for sale in the AAPK store. As for value, if the blades have snap and don't wobble and there is no damage beyond the few pin cracks I think I see, say a few tens of dollars.
I think you should declare yourself an addicted collector and join the fun here.