Help with the patina

Hi,
I would appreciate your suggestions on what type of metal would produce a patina like this.

 

looks like brass....
iron goes black
copper goes green
& sometimes....I get blue !

 

The green is verdigris - oxidized copper. Any alloy involving copper could show that kind of oxidization.

 

Taking a guess it's - or part of - a wine bottle opener. If so, Mak, can you show what's missing or what the second part is used for.

BTW, I like your new avatar.

 

...//.,,,,...<<<<?????

 

Thanks.
I know that copper turns green. I have seen and cleaned a few such objects.
This patina and the texture of its surface looks strange to me. Your answer regarding allloys containing copper, and which can contain different other metals, covers that I guess.

 

A play on "church key".

 

it's a bar tool.

 

Thanks OG!
The cork screw just goes inside the other part, and than its a key as MOS commented.

 

Maybe it's a play on "wine key"?

(I only learned that term when my DD worked as a bartender in a winebar during grad school!)

 

"in vino veritas"
Both are german.

 

I went to school with a cute gal by that name. First name Sarah.

 

OK, I learn something new every day.

Honestly, I have never seen one of those.
Or, if I did I had no idea what the heck it was.

Lot more acquainted with "church keys." We didn't carry
winekeys in the glove compartment when I was in college.

 

I didnt get that one TOG

 

Mak, I never saw a wine opener in a holder of that type - the key shape.

Church key is the name we used for beer openers. The simplest, most needed possession in college.
~ (Thanks again, King.) ~
~ One side opened a bottle, the other a can.

 

N

Sorry,
I meant this post

 

I thought you might have meant that one. That was just a "wisecrack" - play on words.
There were similarly sounding names - e.g. Sarah Weinke , pronounced Winekey.

 

Oh!
Well.... Weinke is very german name

 

don't think it is patina..we gave my father exact one brand new in 1968ish