If your Camillus "Tip Top" Barlow knife has the Camillus name stamped on four lines, it was made in 1942 or earlier. If the Camillus name is stamped on three lines and has a model number 10 or 11, it was made in 1946 or later. I located a 1942 and 1946 catalog that shows the "Tip Top" knives. If you can e-mail me your postal mailing address, I will send you copies without charge.
Tom Williams
Camillus Cutlery Co.