Millions of the TL-29 pattern Lineman's Tool were made, and in the US, it's very common to see several versions, made by several knife companies on tables at gun & knife shows for very low prices
The TL-29 that I came across was $15 and made in China for a US Tool company called "Gardner-Bender".
The blade steel used is tempered Carbon Steel. One blade is a drop point/spear point blade style and the other is designed with a wire stripper slot at the base of the blade, and a slotted screwdriver on the tip of the blade.
The screwdriver straight edge blade has a liner lock, and the rest of the liner is made of brass.
This inexpensive pocket knife is built like a tank, and quite a nice classic jack knife style folding pocket knife.