Ideas on 1 2 3 4 stamp

What does the stamp mean

Teaching a kid how to count?

There are so many possibilities why someone would do that that you'll probably never know for sure. It could be someone who tried his new punches on a coin. The style of the "2" suggests to me that it is late 1600s or anytime in the 1700s. It could also be a coin turned into a token or tally or check of some sort.

If you want to know more about countermarks, here's a thread I started recently as well as a Numisdoc.