Vintage Native American Navajo Pin in Silver and Turquoise.  It has the stamps, sterling and "H".  This piece dates after 1950 when Sterling was stamped on the turquoise jewelry.  Prior to the 1950's pawn turquoise and silver jewelry was made from coin silver, and not stamped sterling. 

This has a beautiful polished turquoise stone as the top piece, and a smaller cabochon turquoise stone dangles from a link chain. Stones are set on sheet sterling, and edged with sterling roping.