Vintage Native Sterling Rosewood Bolo Tie signed

Gorgeous Native American bolo tie signed by artist. Inlaid silver, rosewood wood with leather cord, this dates from the 1970's- early 1980's. my grandfather who purchased it from the artist in Phoenix through a gallery. It's signed but Unfortunately I cant read the signature. Scratches related to storage and vintage use. . Please look at the photos as I'm not a collector or an expert, these are items from my family who are not around any longer and are being sold to help make funeral expenses.