Turquoise Cuff in Sterling Silver Navajo Hallmark

Vintage sterling silver cuff with Navajo hallmark. Conjoined LP or PL. Stone is natural and has green and turquoise colors telling me that this may be Royston Mine turquoise. It has not been filled so there are natural indentations that look cracky but this is not damage from a hit, it is natural to the stone. 

Interior measures 5" plus the opening of 1 3/8". Measures 1" wide. Weight: 30 grams. Some tarnish.