Challenge Cutlery 6"steel square??

[dimwittedmoose51]

Already posted this on GD, but figured I'd hit the woodworker crowd too.  Patent on it is 1904 and very little about it on the internet.  Anyone know of this company that's bread and butter was knife making?

Thanks

DM&FS

[dimwittedmoose51]

forgot the bigger picture including the Klein knife and the 10" Crescent.  My bad

[john k]

No idea on the square and its etch.  But the Klien knife is for a lineman/electrician, for stripping insulation off the heavy overhead wires, plastic insulation that will break an ordinary pocket knife.