Letter Warsaw - Vilnius - Helsinki, letter sent 29.IV.1937 on the first flight Warsaw - Helsinki, additional postmark "FIRST LOT 29.VI. WARSAW HELSINKI Warsaw 2"; on the reverse a Helsinki 29.IV.37 receipt date stamp;
All philatelic values can be viewed at our office in Warsaw, Romualda Mielczarskiego Street 7/19 Mon-Fri 8:30am-4:30pm.
To facilitate the presentation, please contact us in advance by phone at: 691-666-727
