My family history goes back many generation in Canada. I don't know why I keep finding these British coins in my Grandfather's possessions.
I'm fond of calling those "slick Vickies". The 1860-1967 British halfpennies and large pennies circulated for a very long time! (And not just in the UK itself.) Many are quite a bit slicker than your example, there. We had a "Slick Vickie Contest" on Collectors Universe once, to see who could show the slickest one that still had a readable date. Cool thing is, even the really worn-out ones often do have a readable date.