Old Badge For RKO Studios Construction Worker

I don't know the age of this badge.  It is quite a novelty item for the collector of badges or movie memorabilia.  It is made of brass and measures approximately 1 3/4" in diameter.  I have not attempted to clean or polish it, I will leave that up to the buyer~~I am selling it "as found".   It does have some dark spots on the front and the reverse side.  It has a simple "C" clasp closure that works well.  I am assuming that the initials on the reverse side are those of the owner of the badge.  A neat item.  I have been unable to find out anything about it in my research nor on the internet.   Free shipping first class mail with delivery confirmation.  Insurance is at your option.