In the 40s and 50s Uebelacker used many different basemarks with form and size number with and without the text "GERMANY". From the 60s Uebelacker mostly used the formnumber and the size number divided by a "/". The basemark "GERMANY" was used in the 40s and the 50s. In the 70s a base mark with "Made i. W.Germany" was used.  A base mark with the text "Made in Germany" was probably used in the very last year of production 1989-1990. Unmarked bases with ink marks can be found from the late 40s and 50s.  Unmarked bases of special series was also used in the 70s.