polish insignia, help needed

[just]

Hi
can you tell me more for this insignia ? not sure it's polish
Rennica Panstwowa on the screw-back
thanks for answers
cordially
Didier

[Gromow]

http://pl.wikipedia.org/wiki/Wojska_radiotechniczne

[just]

Hi Gromow
thank you and Happy New Year
cordially
Didier