New York Yankees Bronx Bombers Streetlight

This is a New York Yankees "Bronx Bombers" Street light with the figure of Babe Ruth in the center. I do not know how old it is. I purchased it a couple of blocks away from the old stadium in the early 90's at a resale shop. I've displayed it for years, but now it is in storage and i'm trying to find out how it was used exactly. It works perfectly. It has an electrical plug that helps the light light up and and blink green. It's awesome. It's a little dirty, but nothing a little water and a wrag won't clean up, so I'm excited to restore it. Apparently, these were displayed on the streets near the stadium. I'm really interested in the age if anyone can help or give more information.