Thanks for this picture : so the cans were not attached to a special unit.
I try to find on other forum the picture about you talk in you're post.
But, i think that the man who do this paint "200" and "V-80" (very good job) on the can have the time to do it.
I don't imagine soldiers spent their time to paint on can ? and to have the pencil to do it too ...
I'm very disturbed about this can, the origin.
Thank you very much for you help
If you have another information/pictures don't hesitate to share them or tell me : if i find some i'll notified here too