Butterfly Concho Belt

Can anyone shed any light on this silver and turquoise belt? I am fairly certain it is sand-cast and Navajo. It has a artist stamp on the hook but very hard to determine what it is. The pic does not show the details but it appears to be two S’s or some kind of design. It is 37 inches long with 20 butterflies. It is among some things I am selling and I would also like to know the value if possible.

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I can not make out the hallmark, it does appear to be Navajo and sandcast. I would think a retail cost around $250, thanks for sharing