original 1965 Dallas rangemaster . this blows away any modern day treble booster by miles!!! missing back plate.front plate someone painted gold seen in pics . switch basically shot needs fixed or replaced made it 60 yrs. if ya fiddle w switch it works but def needs fixed. this variant is the best one of 4 or 5 they made.. most overdrive according to stu castledine who owns all the variants.