Hello,
We are having an Antiques and Historical Memorabilia auction this week, and one of our lots happened to be this postcard. I thought you may find it quite interesting. It was made on the occasion of the first voyage of Paul König with the world's first Merchant Submarine Vessel, the U-DEUTSCHLAND.
https://www.liveauctioneers.com/item...knig-submarine
I spent quite a long time researching it, this forum certainly helped!
Thanks and Kind Regards!
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