You guys are so right!
I was deceived by the picture at first. Clearly now it is a regular Acton with the lid hinged to the side, probably so a vendor didn't have a lid in his face.
I do agree it looks well made but I think it was done rather recently by the style connector used, and care done restoring it. If it were converted back in the 50's they would have butchered it, as these coolers were so plentiful.
Can't imagine the length extension cord needed for a stadium.