This piece has no hallmarks, but we were assured that it is Navajo sandcast, probably from the '70s:



This is a piece that was described as Zuni workmanship, but from a Hopi pueblo; there is a stamped hallmark on the back, but it is very small and detailed and difficult to photograph. It looks like an owl--I will try and get a shot of it with a different camera setting later.
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I have a few more pieces, but will photograph and post later. Thanks so much for your help!