This Uschi clip is NOT from the Eurocine production EINE ARMIE GRETCHEN (a.k.a. FRAULEIN IN UNIFORM). It is from a US-made nudie called THE CUTTHROATS (or SS CUTTHROATS or SHE-DEVILS OF THE SS).
Just about every red-blooded male on the planet knows Uschi for her amazing tits, but her ass is great too. The scene@ 1:40 shows her butt at it's best. Then the guy pours wine over her tush and then licks it off!!!