According to Levine's Guide, Jowika is the brand of Weber and Altenbach. They made knives in Germany and Ireland.
From what I have heard, the Irish ones were pretty low quality. I don't know about the German ones...but I suspect they were not a lot better.
At the time of writing, Imperial still ran the Irish plant.
Probably gone, now.
A thing worth doing should be left to someone who can do it well.