Cant find a makers mark can anyone ID?

[dc20011]

[daintydorothydoll]

Patent info: 

1618784 US Electric switch

BEAVER MACHINE & TOOL CO INC

Nov 11, 1926 Feb 22, 1927 Granted            

[dc20011]

Thank you this at least is a start and gives me a date 

[md1919]

This is Kopp glass

[dc20011]

Thank you and I looked at Kopp glass and yes there is a familiarity but Kopps design were Asymetrical while these are totally symetrical.

[md1919]

https://www.worthpoint.com/worthopedia/kopp-glass-modernistic-lamp-shade-1872120236

[dc20011]

YOur brilliant. So do you think the compay Kopp made the entire design or someother lamp company contracted them for the glass. I am just asking so that I can be clear to propective purchasers on Ebay