The most successful Leman prism glass was the timeless and efficient Theatis, from Moller in Wedel, introduced in 1920. It was made in black paint, or gilded, but the gilt on a zinc background was not stable. The center focus model was called the Tatisem. From 1927, the Theatis (using the same name) appears in the Zeiss product line. In Jena the last Theatis must have been produced around 1980, and in Oberkochen it was not produced.
This specimen is 46 years old and brand new.