I have several large groups of private Rommel letters on his various command stationary and this is a perfect example of his Panzerarmee Afrika letterhead. I have no doubt this is original and he used a dark blue pencil to sign the brief note.

If you look at his private family letters (to Lucie and Manfred) on microfilm at the U.S. National Archives you will see this same letterhead in addition to other stationary he used while commander of Panzergruppe Afrika and the Deutsches Afrikakorps.