So I'm looking at this old Schuko plug that's been lying at my desk for a while now....and I noticed something.

The rating printed on the face of the plug says
10/16 | 250 (10/16 amps at 250 volts, I assume).

What's with the dual amperage rating? Wouldn't it just make more sense to rate the thing at 16 amps and leave it at that?