"MIG" wrote

That's three people mentioning 1970, but surely the 50p came in in
1969? That's certainly when the bulk of the original ones were dated.

The 10 shilling notes were last issued, and the 50 p coin first issued in
1969. For a year or so they both circulated alongside each other, until,
towards the end of 1970 the 10 shilling note ceased to be legal tender.

Peter