Lot of two vintage sterling silver spoons brought back from a trip through the American southwest about 30 years ago. I believe the cactus spoon might be close to contemporary to that time, and that the spoon with the turquoise was probably a vintage piece already. But Native American art and handcrafts aren't really my specialty!
I didn't find any markings beyond what I've shown, I could not see any signatures on the thunderbird spoon. I believe the artists often used certain designs or patterns of stamping as their hallmarks, but I don't know enough about Indian tribes silver or art to tell you more. I think the stone looks like turquoise, but I haven't tested it. I've left both of these spoons as found, both are very tarnished.