1919 Polish Artillery badge ID help

I don't know where else to look for info so I thought you guys might be able to help me. I have a badge in my posession that I am trying to ID, I believe it to be a badge from the Polish 18th Artillery battery dated 1919. The question I have is: is it original or a reproduction? I have only been able to find one photo of the badge online and it is on the website of the manufacturer named on the back (who sells modern reproductions), I can not find a photo of an original, OR a description of the back of an original. What do you guys think? The owner of the badge wants me to sell it for him but I do not want to advertise it if I don't know whether or not it is a repro. Thanks Sam.