There are an estimate 200 KA-BAR tang stamps used since 1898. However, only a fraction of those are known today and even fewer used on a regular basis. Some of the more prominent tang stamps are listed below.
Prominent KA-BAR Tang Stamps Since 1898
John Jay
KA-BAR
KA-BAR, Olean N.Y.
Ka-bar, Olean N.Y.
Kabar (Pattern Number Underneath), USA
Keenwell
Olcut
Union Cutlery Co., Tidioute, Pa
Union Cut.Co., Tidioute
Union Cut. Co., Olean N.Y. (First Use in 1909)
Union (letters inside North American Shield)
U-R Co., Tidioute PA
Union Razor Co., Tidioute, Pa
VikingU-C Co. Olean, N.Y. USA
Below is a photo of tang stamps taken directly from knives
KA-BAR Tang Stamps Since 1898
KA-BAR KNIVES 