When I was in the army, we were a combat engineer unit, and our supply room stocked the all steel scout knife, and the TL-29. Both were handed out like lollypops at the dentist office. Young guys being young guys, and the knives being freebies, they got ABUSED in a big way. Please note I used all caps for ABUSED!
The steel used for the Camillus TL-29 was a very good carbon steel that took and held a very good edge. The only bad thing was the knife had a screw driver blade. Not a bad thing in itself, but a freebie knife with a screwdriver blade used by young GI's is that if there was not a crowbar around, then the knife became a prybar. As a result, most of the TL-29's I've seen were very loose in the joint from being pried with.
All that aside, yes they are worth saving if you have one in good condition. The blades are good,and the screw driver blade has a semi sharpend bevel for stripping wire that can be used for a second cutting blade that wll save your main blade on real dirty cutting chores. Also if memory serves me right, (at my age thats becoming debatable) the screwdriver blade has a brass liner lock. If it has wood handles its real old, maybe WW2 era. Synthetic came in afterward.
Some people have collections of TL-29's.