German Empire 5 pfenning 1875 double countermarked

Good evening everybody!

First of all thanks to all who are going to reply this post, the very first for me in this forum!

I recently got this coin with 2 strange countermarks “5”.

Surfing the web I only found only this other coins that is similar, but no information about what do these countermarks mean.

https://www.ma-shops.com/koci/item.php?id=86575&lang=it

Thanks again to all those that Will help me!

Giacomo

This is called "Countermark".
It is a small stamp that is placed on the money later. This term is used in the numismatic language to mean the second stamp. Since the newly minted coin itself carries the first stamp, the stamp placed on it later will be the second stamp, that is, the "countermark".

The four most important reasons for striking a coin are as follows:
1) To revalidate a coin that is worn out or out of circulation.
2) To make the coin valid outside the place where it belongs or was minted.
3) If you want to make a change in its value, indicate this change with new numbers.
4) To show that the quality of the coin minted from precious metal has been checked.

Never seen any mention of countermarked German Empire coins in any catalogue. 
A 5 being punched into a 5 Pfennig coin makes no sense, especially as it is still clearly visibly as a 5 Pfennig even in its worn state.

I suspect scammers are taking worthless worn readily available coins and stamping the 5 in themselves to try and sell them for higher price, like the heavily worn 1875 G on your example link for £22! It’s worth 10p, yours too is a 1875 A, very worn.

1875 is the most common year, A - I think the most numerous mint mark for that year.

Other years and mint marks can be worth a bit, so I guess the people not being able to find them think be stamping a 5 on them they can get a better price.

That looks like an unofficial counter mark which is classed as PMD