Antique Letter O - Building Marquee Sign Beautiful Cast Bronze Brass Art Deco

This listing is for the letter O
It is 10-3/4" tall and 10-3/4" wide
I don't know what they are made of exactly but look to be brass or bronze.  There's a photo of a missing screw that held the mounts to the letter on the backside of the letter, showing what its made of.
Please see all photos.
One mounting prong is intact on the back of the letter.

Removed from a school building in Columbus, Ohio, that was built in the 1910s or 1920s.  The letters were on the front of the building - the building is being stripped for renovations, which is how we acquired them.

I have 10 antique letters at this time, so please check my ebay store for more!  Search the word "letter" to find them.