1850s Dietz Brother & Company Lamp Part

[caprock]

I found this brass item and didn't think much of it until I cleaned it up and saw the eagle and company name. Dietz made lamps and lanterns for years but was known as Dietz Brother & Co. only between 1840 and 1855. I am trying to find a picture or drawing of what the lamp looked like. I think it may have been a whale oil lamp. Any help greatly appreciated. Piece is approx. 2 inches by 3 inches and flattened, apperars to have once been round.

 

[Icewing]

https://www.bing.com/images/search?q=Dietz+lamp&FORM=HDRSC2&PC=MOZB

 

[caprock]

Thanks Icewing, but so far, I could only find "Dietz" lamps, among those pictured, which are much later than "Dietz Brother & Co"., but I will keep looking.