I believe it is from the 40s. Needs repair but all parts look to be original. Powers on but produces a loud constant hum. It does produce sound from a plugged in instrument on all 3 inputs. Tubes light up but red power light does not. Leather on handle has come apart. Power cable has electrical tape on it. Various scratches and marks on case. See pictures for details. Very sought after rare amplifier desired by harmonica players and blues musicians. Amp dimensions are: 13 x 11.5 x 7. The item “Vintage Masco MU-5 Tube Amplifier (40s)” is in sale since Tuesday, July 13, 2021. This item is in the category “Musical Instruments & Gear\Vintage Musical Instruments\Vintage Guitars & Basses\Guitar Amplifiers”. The seller is “foamieomie” and is located in Lexington, Kentucky. This item can be shipped to United States.