cover 1942 (16 June) locally addressed U5, bearing Straits 8c. with single frame chop in red, clearly cancelled by bi-lingual Syonan c.d.s. and showing large "RETURN TO SENDER" h.s. in violet (Type I12) with, on reverse, unframed "Not known" (Type I13) and "RETOUR" (Type I19) h.s., the last two with Economy Label affixed over the top. Photo