Small Pin Fire Cartridge

I recently acquired the tiny pin fire cartridge shown in the picture, against a 6mm for scale. The case length is 3.52 mm and the diameter 2.08mm. It is open at one end and does not appear to be loaded. Is it genuine cartridge?

Look here;

https://www.frankonia.de/p/schreckschuss-pistole-berloque-mini/92313

Rgds

The Japanese also made them.

Thanks Pete and dutch for your replies

Here is info on them: