Reichsarbeitsdienst 6 pfennig green and 12 pfennig red in vertical strip of 3 on registered censored envelop with original contents from Berlin-Spandau 31-7-1944 to Albania, very fine. Correct Europe-rate of 42 pfennig for a registered letter; Albania was in 1944 one of the few  European countries having this rate, scarce!