I picked up a 1973 Fender Bassman Ten 50 watt 4x10 combo in trade. What's "unique" about this amp is it is covered in brown western tolex and has gold grill cloth. I know Fender has some amps that use this but I haven't seen any Bassman Tens with it during my research. I suspect this is an aftermarket job as the back panel isn't original and some of the seams are a little off. I've attached some pics for review. Can anyone confirm or deny? Thanks!