Old Pawn Bracelet with Unknown Makers Mark Navajo Sterling Turquoise

I have this wonderful cuff bracelet and it appears to be "Old Pawn." The biggest mysteries about the piece is the unknown hallmark which is on the inside of the bracelet. The mark is an arrow along with a U, which could be a horseshoe. I also don't know what kind of turquoise this is either. I love the bracelet and it has lot of originally patina. Any info would be greatly appreciated.