Juzek basses NEVER came from Prague. Prague basses are a different animal. ALL Juzeks are Germanic in nature, made on the border pre-war and in Bavaria after.
The Gamba basses were mostly made by B. Lang I in Shoenbach and the nicer violin models from Anton Wilfer, prewar. Some labeled Juzeks came from another importer to fill orders and they put their label in them for to the sale without a Blume.
The later post-war basses came from Wenzel Wilfer on the nicer ones and Lang II in Mittenwald as well. Maybe Wilfer made Gamba models for Juzek as well, maybe. The later company Emanuel Wilfer is a firm, not a person of which was dead 100 years earlier but this is post-Wenzel Wilfer. Possibly headed by Roland Wilfer. I think I met him in Frankfurt but introduction by Bobby Juzek whom I have known since I was just turning 15.
That bass in that thread is a Hofner Blume and not a Wilfer or Lang. All of these shops made for the trade. Very few of the basses Lang and Wilfer made had their own label BUT, I have seen all of them with original labels over time and can tell the difference. Every time someone says Juzek, they equate it to Wilfer which is not the case. Only some of the nicer models pre-war were from Wilfer.
And the Master-Art thing, so many basses have those labels and they do not belong. The MA basses were from either Wilfer, amber varnish, not shaded, violin model. HIGH Flame and individual gears, not plates. That is the true MA model. Even in the 1934 catalog which I have, it is described that way.