1976 Westminster RB500S Rickenbacker 4001 Style Bass Guitar (MIJ)1976 Westminster RB500S Rickenbacker 4001 Style Bass Guitar (MIJ) Up for grabs is a rare and absolutely stunning Westminster RB500S, built in 1976 at the renowned Matsumoku factory in Japan. This era of Japanese craftsmanship is known for producing high quality instruments with excellent attention to detail, and this bass is no exception. Sporting an exceptionally unique green burst finish, bound rosewood board, and dual single coil layout, this