Interesting Bullet

[Hamfam]

So, I've had a bullet for a long time that is supposedly from WWll. It says, going counter-clockwise " 20mm - MK5. MOD.0 . 64 . 9 . RNO ". So, is it actually from WWll, and what would've it been used for?

 

[Hamfam]

Here is a picture.

 

[Arizona_Mike]

Asked and answered 10 years ago in this very forum (1st search result when typing "20mm mk5" into Google):
https://www.thehighroad.org/index.php?threads/20mm-dummy-round-need-info-please.252634/

Mike

 

[Hamfam]

Asked and answered 10 years ago in this very forum (1st search result when typing "20mm mk5" into Google):
https://www.thehighroad.org/index.php?threads/20mm-dummy-round-need-info-please.252634/

Mike

Thank you.