Question on makers mark on wine bottle

[gdog68]

I dug this wine bottle with grapes embossed on it. I looked up the glass makers mark and it looks like the crystal glass co from 1921 to 1928 according to sha.org. If I identified it properly it would be during prohibition?

 

[nhpharm]

I think that was intended to be a G in a square for Glenshaw Glass Company. That design patent number is from the late 1930's, so your bottle is probably from later than that.

 

[gdog68]

thanks that makes more sense. late 30s 40s