As this community´s motto is Education, I will try to educate the ones, which still wonder how can they make a difference between a genuine silver 5 gulden (1923) coin of Danzig and a forgery.
The first difference is the material, the fake coin here is not made of silver, the good one is made of silver, but that is not the point I am trying to explain here.
It is all in the details, which I would like to show here:
Genuine Coin:

Fake Coin:

Genuine Coin:

Fake Coin:

Genuine Coin:

Fake Coin:

Genuine Coin in PCGS Slab:


Here are the edges of two fake coins:

Here is the edge of the genuine (certified) 5 Gulden coin:

Here is a photograph of two fake coins (the larger ones), which were mixed with genuine small-denomination coins and sold as a package by an unprofessional in numismatics entity:

I hope, that everybody can spot the differences for themselves and keep away from such pieces.
All information shown above is given by me in this forum is just a suggestion and without obligations on my side.
Merry Christmas and a Happy New Year!