Shaving-mug style teacup 

(or maybe it really was designed as a shaving mug) 

German-made porcelain ( not pottery);

 thick but translucent when held up to the light

 Like-new condition:

 no visible wear, cracks or chips 

Beautiful dark blue design on white 

possibly blue onion

Gothic lettering on one side reads " Tee pott "

 On bottom: " KRUGER " 

(w/ umlaut over u), beneath stylized trees and wavy water-lines within oval trademark. Beneath that: letters too hard to read.

 Cup holds about 10 oz.,

 is approx. 3 3/4 " tall,

 approx. same in diameter.