Michael Wittmann (panzer-ace of LSSAH) - the most rare postcard ever! Design created by famous 3rd Reich artist Wolfgang Willrich, but for some reason never published. 
Postcard comes in 2 variants - autographed by Wittman himself and not signed.
 
For more material dedicated to Wittmann visit his dedicated page here.
 
Check:
Knights Cross award certificate
SS ID of Wittmann
Signed photo of Wittmann
SS Honor Ring award letter