Marty - I thought we had ID'd the jackknife in the Luke Inventory as being something other than an Imperial knife, but I see in the inventory that it is simply listed as "Bone Handle, double blade Jack Knife, large Blade No. 22309" Was there something about the Model / Serial number that led us to the manufacturer other than Imperial?
The artifact matches the Imperial nicely, but this new Camillus option certainly looks like it needs to be examined closely to rule it in or or as a possibility. I think pocket knives generally were in ubiquitous use in those days, and many companies obviously made similar if not near identical products. There may be others that the Niku knife comes close to.
As Marty says, the best way to test this is to obtain a vintage Camillus example, so if anyone happens to come across one....
Andrew