Marconiphone six-valve Superheterdyne Portable model 255  
serial number: 003712
chassis
fabrikant: Marconi
rør/tubes: 8VA (5ben)-HL2 (4ben)-S21 (4ben)-S21 (4ben)-LHC (4ben)-S21 (4ben)
alle org. Marconirør.
år: 1932