Hi,
the only thing done in Wetzlar nowadays is final assembly from modules built elsewhere for the Victory series and customer care.
It used to be like this (most components built in Hungary, final assembly in Wetzlar) with the Conquest series before, when Victory was still actually built there, maybe that's why your examples are "Made in Germany", which unfortunately is a fairly lax designation of origin.
Today Conquest HD series is from Kama Japan afaik, and the Terra from Kama in China - except for the 25mm models which used to come from Japan until lately.
There is by the way no such thing as Zeiss glass, the company (independent but like Zeiss AG under the roof of Carl Zeiss foundation) you mean is called Schott. Whether the Terra ED line contains only Schott glass is hard prove or disprove, they advertise Schott ED glass so we probably have at least one ED element from Schott in there.
Joachim