Vintage 70s Fender USA Mustang Duo Sonic Hard Case Fender This is a genuine hard case from the late 70s, featuring the Fender logo and a red interior, MADE IN U.S.A. I acquired this as a case, but it appears to have originally been the case for a vintage Duo Sonic (see images). Of course, it's also a perfect fit for a Mustang. It's USED. The handle and latches are in good working order, and the exterior and interior are in good condition, giving it an overall impression of a high-quality vintage case. Vintage cases for Duo Sonics and Mustangs are difficult to find on their own, so how about it if you're looking for one?