Finished one up today. Steel is 52100 heat treated by Peters to 59-60HRC. Handle is stabilized maple burl (with a touch of spalting) and rosewood, with G10 liners.
The sheath is made from regular cow leather with a panel of lizard belly showing through that window. I'm not a leather working expert so I'm not sure if there's proper terminology...just a dude with mostly homemade tools working by hand
The blade is belt finished and has a definate scratch pattern that doesn't show in the pics. One day I'll get the shoulder fixed so I can do up every knife in the satin finish they deserve.
Hope you enjoy.
ETA: spine is 3/16 inch thick spine, full flat grind. Has a nice solid hefty feel to it.