3 G. "Zoppot"-Freimarke in mixed franking with 35 Pfg. and 20 Pfg. national coat of arms on special delivery registered air mail letter (large size) from Gdansk 1 airmail 10. 8. 27 via Berlin with red Airmail-best. Postmark to London with arrival postmark and on face boxed handstamp of one line "by special delivery fee PAID", cover once folded and in the margin with transport traces