Vtg Native American Portrait 15x20 unsigned From Big Sur Coast Gallery CA

up for consideration is a nice old Native American Indian Portrait from the Coast Gallery in Coastal Big Sur CA. The painting measures about 15 by 20 inches and is fairly well done. The artist used standard illustration board.  There is some writing on the back in marked along the stretcher...looks to be from the 60's or 70's. This was purchased from an estate in Pasadena CA on a recent buying trip. If you have any questions or something to share please message me... Thanks again for your interest and be safe out there...  Best Regards, Johnny JohnnyCrystal Est. 1987