Used WWII-era German Postage Stamp featuring Adolf Hitler (6 Pfennig)

This is a used postage stamp from the Nazi Germany era, specifically featuring the profile of Adolf Hitler facing left. The stamp is printed in a dark green pigment and carries a face value of 6 Pfennig, as indicated by the numeral '6' in the upper corners. Below the portrait, the text 'Deutsches Reich' is printed in a Fraktur-style font. The stamp is currently housed in a clear protective plastic sleeve and is mounted on a piece of tan paper or cardstock that includes handwritten identification notes: 'Nazi Germany WWII ERA'. The stamp displays a partial circular black ink cancellation mark (postmark) over the portrait, indicating it was used for mailing purposes. The perforations around the edges appear somewhat irregular or worn, which is typical for a used stamp of this age. There are no immediate signs of major tearing, though the alignment of the print appears slightly off-center. This particular design was part of the standard definitive series issued during the late 1930s and 1940s (specifically starting around 1941) and was produced in very high quantities, making it a common find in historical stamp collections. The paper shows slight yellowing consistent with age, though the green ink remains relatively bold.