Current company info, btb:
http://www.mideal.cz/en/about_lidl. Brno is a city in Czechoslovakia.
Anyhow, why it's not a Kohlert:
* 4-digit s/n. All the Kohlert stencils I've seen carry the Kohlert serial numbers. That'd be your choice of an about a 1902 horn or a 1953 horn. Neither of those look like the Lidl.
* The Conn Artist-like ("naked lady") G#/C#/B/Bb cluster on that Lidl is considerably different from Kohlert's. Any model of Kohlert.
FWIW, there are Google mentions of both a "Master Prima" and a "Master Prima II." Actually, most folks flip the words. In any event, it just gets translated as "Great Master," in German, but I could have transliterated that from the Latin.
I'm working on a few sax-related projects, one of which is trying to make a visual "cue sheet" on which horns have what features, so I'm definitely not going to say, "This horn was made by X." At this point, all I can say is that it's a Lidl.