Or perhaps a Franklin. He's on a hundred dollar Bill. I can definitely understand you not getting the reference.(In the UK) of course. See the last sentence in the first paragraph here.
A Century I can understand, but what do you mean by a Ben? A Ben to me (Scottish) is a high mountain or mountain peak.
Ton makes sense, but was surprised to see it based on MPH. Since Y'all switched before us (or US), and definitely before I was stationed overseas, I was thinking it would be KMPH, not thinking at first that our measurement system is actually based on yours, if not in fact being yours.