Flea markets in/near Aachen (Germany) this April 11

[batterytypehah!]

I never seem to hit the right markets when I'm back in Germany (once or twice a year). I'm interested in stuff like I have in my signature below, plus this year I'm in the market for FSU cameras and lenses. I haven't seen dealers with FSU gear for a long time, seems they either sell in Berlin or on ebay these days.

Aachen and surroundings only (Maastricht? Liège?), weekend of April 10/11. Anything?

Thanks!