The Car That Witnessed the Spark of World War I - The New York Times
Gräf & Stift - Wikipedia
A pair of handled vases with floral decoration, Christofle, Paris, c. 1920 - Jugendstil and 20th Century Arts and Crafts 2021/07/07 - Realized price: EUR 896 - Dorotheum
A triple motor mystery of the familly Windischgraetz (update: Austro Daimler, Puch, Gräf & Stift?) - PreWarCar
Gräf & Stift car used to take Karl into exile in 1920 with the imperial crown in front : r/austriahungary
File:Hugo Wolf Park um 1920.jpg - Wikimedia Commons
MAN corporate history | MAN
Warren Harding and Mrs. Harding seated in the back of a convertible automobile enroute to or from the U.S. Capitol on the day of his inauguration] | Library of Congress
The Car That Witnessed the Spark of World War I - The New York Times