Who is the manufacturer?
My guess~maybe here/info...http://www.ebay.ie/itm/112036353260
I didn't think so, it's a little too "white" to be Lenox.
Now THAT brings back some memories.
I assume Lenox is used at the White House. Pictures of cabinet meetings frequently show lots of cups and saucers, creamers and sugars Though somewhat similar to the cups pictured here, I would assume that the White House uses Lenox. Maybe embassies have different dishes or maybe they did at one time?
There was a factory for Royal York in Bavaria, Germany. Could be pre-WW II, used in the U.S. Embassy in Germany.