1931 (Jul 27-30), Polar Flight, Friedrichshafen to Malyguin (Michel 205c), 1m-4m Polar Flight Zeppelins complete tied by Friedrichshafen c.d.s.s on cacheted Polar Flight Zeppelin cover to the Icebreaker Malyguin, Fine to Very Fine.
Scott C40-C42; $1,135. Michel €1,500 .
