1933 Graf Zeppelin South America Flight, signed Karl Beuerleuerle

1933 Graf Zeppelin flown card with a 12^th August posted onboard postmark and special South American flown cachet. This mail was part of the Barcelona mail drop as per the Sevilla backstamp dated 15^th August. It has been signed on the reverse by engineer Karl Beuerleuerle, a lead mechanic on the Zeppelin. He had previously served on various WWI Zeppelin airships before joining the Graf Zeppelin from the start of its operational life.