Grand Prix Brussels 1958

I quote www.zenitcamera.com :
"At the Universal Exhibition in Brussels in 1958 a set of lens was presented (...), which was honored with the highest award: "Grand Prix".

These lenses were shown:
Russar MR-2, 5.6/20mm
Mir 1, 2.8/37mm
Tair 11, 2.8/133mm
Tair 3, 4.5/300mm
MTO 500, 8.0/500mm
MTO 1000, 10.0/1000mm

My Mir-1 wears the mention "Grand Prix Brussels 1958"
I've never seen it on the other lenses, except for the Tair3, but I prefered to buy a newer version lens than the one using M39 screw mount which wears this text.
Cameras also were in the awarded lot, like the Leningrad.