Brokové náboje, určování roku výroby

Dobrý den přátelé,
Hello,
I am looking for a key to determine in which year these cartridges were produced, I have more Dekuju za pomoc.

Google translation:

Good day friends,
do you have any chandelier [key] to determine in which year these cartridges were produced. Thank you for your help.

Hello,
I am looking for a key to determine in which year these cartridges were produced, I have more

Polman published pictures of the code in March 2018.
Search for “Waidmannsheil before:2018-04-08”
and open the thread “Helping Identifying European shotshell”, scroll down to March.