Germany 1951 5 mark eagle have a hand - arm

Hello. I have this coin and I am trying to find information for the value , quantity and who made this coin.There not to any catalogue. 

gaah! trench art

maybe this guy

Does it have an other side?
Does it have weight and dimensions?
Nice thing!!!
Probably made near the end of WWII (just a guess).

I would guess its the work of an BRD critic person.
Possible are
- left wing students or RAF sympathisers.
- Reichsbürger or other nationalistic movements.
- or just a random person who wanted to show his opinion about the republic or the design of this eagle :)

This is your coin:
https://en.numista.com/catalogue/pieces1933.html
The hand detail was done afterwards by a private individual.

@alfonz
I thought for a second you meant the Royal Air Force there! Now I'm thinking of a disgruntled WWII veteran on their retirement/holiday in West Germany doing it to the coin, in their spare time.

Thank you everyone for your reply. I know the coin and I have found it to Krause catalog but not as show but simple. Today I visited a jewelry shop friend of mine to check the metal is made this arm. He told me after testing it with a toxic it is pure gold. Arm is made of pure gold. I guess price will be more than catalog write. Front side is

...een bijzonder geinig ding!...