I've seen examples of that knife before, too. I believe it dates between 1941-46, according to one Bladeforums tang dating post.Is there anything stamped on the blade besides:CamillusCutlery CoCamillus, NY
Have a look here:http://www.collectors-of-camillus.us/Catalogs/Catalogs.htmIt looks very unusual, so hopefully it would not have been made for many years.
1941-46 is about right, then.