souvenir sheet issue "Daposta", souvenir sheet pair with airmail souvenir sheet in colour black gray blue, each with 5 pfennigs national coat of arms in coil perforation on registered mail from Gdansk to Halle / Saale respectively Berlin Steglitz with arrival postmarks reverse, airmail souvenir sheet as First Day Cover from 6.6.37, slight traces of transport, both expertized Infla Berlin, airmail souvenir sheet additional expertized Kniep BPP, Michel 400.- plus