1927, steamer Hamburg, special delivery registered letter with on both sides 8 x 10 and 2 x 5 Pfg, partly not intact, to Vienna, foreign cancellation with US sea mail duplex 1.7.27 and no. \"14\", the on the back franking with German HAL flags postmark 30.6.27, sea mail registered label\". Hamburg New York\", arrival Vienna 5.7.27, unusual variety and for sea mail a very scarce postage step