Opinions On Zeppelin Cover -- 1934 Deutschlandfahrt

I recently purchased the cover illustrated below. It was mailed from Overveen, Netherlands, on May 18, 1934, transported to Berlin (where it was received on the same day) and then carried on the Graf Zeppelin to Friedrichshafen (where it was received on May 20, 1934).

According to the Sieger catalog, this treaty mail cover flew on Flights 359 and 360. Flight 359 left Berlin on 5/19 and arrived in Koenigsberg on 5/20. Flight 360 left Koenigsberg later in the day on 5/20 and landed in Friedrichshafen approximately 13.5 hours later. The Sieger catalog number for this cover is 246Bb.

My query lies in the fact that the Sieger, Michel and Frost catalogs all do not list the Netherlands as an incoming line for Flight 360. They only list treaty mail coming from the Netherlands for Flight 359.

Since this cover clearly flew on Flight 360 due to the Friedrichshafen receiver on back, I am wondering if this fact pattern makes this cover very rare or is it just an oversight by the three Zeppelin catalog publishers.

Any thoughts would be appreciated.

One possibility is that it was an unofficially accepted cover for the flight rather than an actual treaty flight and hence it would not be listed in the catalogs.

Neeskens, have you tried contacting the catalog editor(s) with this question? Seems to me that they would have the first-hand answer to this.

Peter

This is just a guess, but it's likely that the incoming lines reference only those which fed directly into that flight (360). Since you know yours flew on 359, the applicable incoming flight would be that which fed into 359, not 360.

Could be, Postmaster, but Switzerland and Liechtenstein are listed as incoming lines for both flight 359 and flight 360.

It's possible that both of those had mail deliverered both to Berlin for 359 and Königsberg for 360, but the same wasn't true for the Netherlands.