The red approval stamp is proper for the May flight to the US, with the correct "d" for Frankfurt am Main. I don't think the amount of postage is correct (probably excessive), but I don't have access to my catalogs at the moment to check. The first North American flight was loaded with philatelic covers, so excessive postage wouldn't be a surprise.
Any idea of what this might be worth. I mainly bidded on the lot because of a Olympic cover that I liked it was a lot of 2 covers. Might put the first one up for auction here in a few weeks
Sieger, for those of you who don't recognize the name, is a comprehensive German-language specialized catalog of worldwide Zeppelin covers. Mine's about 20 years old, so its prices are out of date, but it's answered a lot of questions over the years.
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