Trying to identify/value a few knives...help

[FriedliB]

I have a few knives I'd like to identify and value. I'm not a tech guy so having trouble attaching my photo's. The first is a bone and brass Balisong. It's got two "rising Suns" on the lock portion with 3 grooves between the sun's. The second is a hand made knife. There is a picture etched on one side of the blade "farmer in the desert" and a design etched on the other side with "Made in Mexico F. Cervantes Oaxaca" on it. It has an exotic wood handle and dark brown leather hand sewn sheath. The 3rd is a smaller full tang, antler handle knife. Polished straight edge with "Puma-Hunters-Pal Genuine-Pumamaster-Steel Germany 6397" on it. It's in a leather sheath with a Puma head on it, "Puma" stamped under that. The last one is a hand made full tang bone handle knife. The only markings I can find are on the tang near the handle. "Crown picture with 12/M". I believe they're WWII era.