Trade Union or Manufacturer Logo Screw-Back Lapel Pin; Ideas?

The enameled face is 0.400" diameter, the Greenduck Co, Chicago back is 0.550" diameter. The card is ~1.250" square. Weight is 2.2 grams on the card.
The fisted arm gripping 6 lightning bolts suggests electricity...or radio...to me, an' somehow early 20th C.
Google image is no help; it thinks the arm an' bolts are an animal with antlers. Are any of you familiar with this symbol an' the initials in the white enamel circle (2 of which are repeated within the blue enamel)?
I've struck out, but thanks for lookin'!
EDIT: Here's more about Greenduck Co. Turns out the single word spelling was an early form; later they went to Green Duck.
https://www.madeinchicagomuseum.com/single-post/green-duck-co/

 

https://www.ebay.com/itm/334943598201
Old Antique Vtg 19th C 1890s Felt Gapa Lodge Fraternity Fez Hat W/ Brass Badge

 

https://hellenicamericancc.org/greek-american-fraternities/
"Many of the early immigrants in the Greek American community of Portland found stability and camaraderie through fraternal organizations that promoted the ideals of Hellenism and social cohesion. Two of the most prominent organizations were the Greek American Progressive Association (GAPA) and the American Hellenic Educational Progressive Association (AHEPA). "

 

Wow! Thank you Very Sincerely, Marote...Perfect!

 

The lightning bolts tie the imagery to the god Zeus. Can't get more Hellenic than that.

 

Ahh...how well the full image comes into focus when presented to the profound resource our membership embodies! What a wonderful bunch of folks; what a cherished an' deeply valuable place. Thank you, all.