Hoagland's / The Rexall Store reverse painted glass large pharmacy sign

The sign is very large -- it is 33" tall and 76-3/4" long.  It's reverse painting on glass with a wood frame.  Painted as if banners, it says "Hoagland's" on the red top and "The Rexall Store" on the black bottom, connected by a yellow design, all on a green background; all text and images are edged in gold.  

 

The way my father took the picture also unfortunately covers the style at the end of the line from the 'R' under the word "Rexall", so please let me know if that matters.

 

My father told me it was likely from the front of or outside the store and is typical of signs circa approximately 1920.  I do not know from which state it comes.  It's in excellent condition though could probably use minor restoration on very small parts of the paint in some of the white lettering only. 

 

 I would love to find out more about the history of this particular sign as well as its value to share with my parents, so they can consider whether to sell it.