Who is this person?

[Eva Elisabeth]

Betty, you stumped me! I didn't expect someone would guess it so quickly.

You win a Zeppelin flight:
http://www.zeppelinflug.de/zeppelin-flights.html

Graf (Count) Zeppelin was first lieutenant of the Prussian Engineering Corps and acting as an observer for the troops of the Army of the Potomac. In May 1863, he met with Abraham Lincoln to get a pass to move freely within the Union lines.

For those who haven't read the fascinating article in the latest Surratt Courier, here's the NYT-article of January 14, 1914, which was one of the sources:
http://query.nytimes.com/gst/abstract.ht...5B848DF1D3

One tidbit mentioned that in America, due to the climate, Graf Zeppelin had changed his stiff, embroidered collar to a light, turndown one, on which he had his first lieutenant stars sewn, and as a result was mistaken for an American lieutenant general, on which he commented:"Not even in America did I expect such rapid promotion."
Above you can see the "American version" of his collar, and here's the original one:
   

Here:
http://rogerjnorton.com/LincolnDiscussio...t#pid23648
...we once discssed how comfortable the McClellan saddle might have been. "Uncomfortable" was the majority's assumption. Graf Zeppelin's opinion was the following:
"Instead of the ordinary English saddle I chose an American wooden saddle, such as was used by the American soldiers. These saddles were so excellently made as to cause scarcely any discomfort. The stirrups were of thick wood, like those in Mexico, with a leather covering over the front part. They had the double advantage of protecting the foot from cold and preventing twigs from getting caught in the stirrup during a ride through the underbrush. Later on I turned over this saddle to the Prussian Ministry of War for experiments, which were quite successful."

Here, finally, is a unique picture of another meeting of Lincoln and Zeppelin in 1936:
   
[Lincoln Zephyr with Graf Zeppelin. Gelatin silver print by Grancel Fitz (1894–1963), Metropolitan Museum of Art]