I collect all kind of crown caps from all kind of drinks from all over the world.

For me factory new caps and used caps are separated collections.  I want them both, used and unused. 

Crown caps from different factories are sometimes the same, but sometimes there are little diffences. Here on the right 2 caps from de same factory (R.R.K.), but with little difference.

Found the difference? See "1825", the right one has a smaller font.