Bauscher Weiden has been in business since the 1920s and continues. It is said that crockery and insulated tea or coffee pots that are marked with D.R.P. Are protected under a copyright that came to an end in 1945. At that point the same articles were made by the firm but have the mark "U.S. Zone" on the bottom of the ceramic pot.
The original 1920 - 1945 silver plated, hammered brass, felt insulated teapot or coffee pot warmers were fitted with bakerlite knobs and ball feet which will by now have gone an attractive and prized amber colour. Post war pots were much the same but were fitted with give-away white plastic knobs and feet. They have remained white and clearly identify the pot as post WWII. These are much more common and less valuable than the genuine 1920s-1945 Bauhaus, Art Deco design bakerlite ones. The silver plated mettal work is stamped with WMF.

It seems clear that U-boot crockery is indeed fake, the arguments for this have been well made.

I own two original 1,4 litre insulated tea pots, 1 original broken one, I post WWII plastic knobbed 1,4 lt teapot and a post war 1 litre chromed tea set. I must get rid of the latter and the plastic knobbed job - the difference is marked!

Incidentally the lid hinges and silver latch buttons tend to go but if careful can be very successfully resoldered, the felt insulation does need replacing now and then, but the design is pure Bauhaus and extremely practical as well as very attractive and collectable. If you find one with an amber coloured knob and feet snap it up, it's an original.
Finally, the pot lids are very easily dropped and broken, I've found that a piece of thin ribbon threaded through the air vent makes a much safer "handle" for the lid.