Gold coin Winston Churchill 900 (big) cannot find any information

[marcus]

Dear all,

I'm writing to you from Germany and hope someone might help me finding which what kind of gold coin I have inherited from my parents.

I did intense research on the internet and simply couldn't find anything on this specific coin (not even a picture although found a similar one).

 

Text says-front: "Winston Churchill 1874-1965" showing him with victory sign

Back "June 1940... The finest hour" showing Big Ben marking 3 to twelve.

Seems to hold 900 gold.

Please have a look a the picture. I would very much appreciate any information on the coin.

Thank you.