Your cover is listed in the American Air Mail Catalog as number Z-413. As was mentioned it was flown on the Hindenberg Zeppelin from German to the US on its 5th flight to North America that year.
As for its value I am afraid it is relatively modest. You might be able to get somewhere in the $10 dollar range on a good day on
ebay, or a bit less. The cover itself is not rare and on top of that there are some serious issues with it that hold down the value. A couple of months before this was flown, German issued two very attractive engraved stamps with pictures of Zeppelins on them - yours has one of these - the green one - but it does not have its mate - the blue one. Many collectors are fairly picky especially when it comes to relatively common covers so most will want a cover with the pair of Zeppelin stamps. The second problem is that this cover is was back stamped on arrival in Lakehurst, New Jersey. That receiving postmark is considered to be quite important to most collectors as it proves that it was flown on that exact flight. The third issue your cover has is that it is in fairly poor condition with the toning and worn corners. Again, collectors want really nice examples and they are not hard to come by. The fourth issue is that yours has those US stamps on it. They were not at all required and are just a philatelic thing done by the guy who prepared the cover. They detract not only by their presence but also by their condition and the fact that one of them goes off the edge of the cover.
A cover in very clean and crisp condition with both Zeppelin stamps (the blue and the green) and proper backstamp and nicely done from this flight might go for around $20, but this one is not such a cover. My suggestion is to keep this as something to remember the person from whom you
inherited these covers as that kind of value is far above what such a cover might bring in a sale.
Posted 02/02/2017 4:07 pm
