Antique German Presentation Cup

I bought this today. It is 13.7 inches (35 cm) tall. The only mark is WNMF. (I don't think it's WMF).

One side is engraved with: "Ihrem lieben Kameraden Arnold Ebbinghaus gen. von den Vorstandsmitgliedern des L.V. Hemer." The other side has a list of names. I found that L.V. can refer to Air Defense, but since the trophy is dated 1831-1901, that feels too anachronistic. Could this be for a club or landsmannschaft?

The other weird thing that's throwing me off is the material. It has a brassy matte finish on the outside, a shiny gilded finish on the inside, and the bottom of the cup is silver-toned. Where there is rubbing, it shows that the material underneath is silver-toned, while there is dark tarnish in some places that I associate with silver. Yet, there is also some minor verdigris. I don't think it's gilt silver, but something about it strikes me as off for brass... It weighs only 525 grams.

EDIT: It's silver-plated brass, I think. Or once was. The dark areas polish up like silver.

 

Brass with pot metal cold painted eagle? It's a WAG
I guess the eagle could possibly be lead.
I do see what you mean by the "white-silver" color on the bottom.

 

What's a WAG?
Eagle is a bit silver-toned on the top, but on the bottom parts, it is black/dark brass-toned. Didn't feel terribly heaby, so it's probably pot metal rather than lead.
Yeah, it's weird.

 

Hi Barn Owl,
WAG is a short cut for Wild Ass Guess.
greg

 

Thanks. Never heard the acronym before

 

Could it have been silver plated and polished so much the silver wore off?
Or it might just be tarnished. Take a little silver polish and rub a very miniscule area on the bottom back side of the base.

 

Yeah, it was once silver plated. I polished one of the dark areas, and silver shone through. I'm going to leave the rest of the patina alone, since I think that the black areas are a better contrast with the brass.