More number trouble

Here's another one to add to my earlier post on number differences. I write my fours with a closed top, but apparently here in Germany all fours have open tops. At work this was mistaken as a seven (with the cross bar) where the ends happened to touch and "corrected" to a seven. Now I am trying to relearn to write fours with open tops and in the meantime we have ordered preprinted stickers to label the stocks. The irony is on the printed stickers the numbers are exactly the way I write them, one as a line (1), seven without a crossbar (7), and four with a closed top (4), but this doesn't cause any problem because they are printed ... ?