23BH512 up for sale is a new re production from old stock vernors tel A Signs clock face , this fits the 20 inch clock that was made in chicago back in the day , this glass face is 18 5/8 outer diameter and has the 5/8 hole in the center like the originals this is the 1/8 thick glass , see our store for more items like this we add new items weekly to our store , thank you rwk