Vintage 1920s S.S. Supply Company Great Lakes Div. Advertising Metal Sign

Vintage 1920s S.S. Supply Company Great Lakes Div. Advertising Metal Sign

Could not find much history on this company but based on advertisements I could find in old books it appears this company specialized in selling paper products such as envelopes, notepads etc. Great look to this sign! Approx. 18” by 13.75”