In 1984 and 1985 queen's effigy was recut and different, low relief was introduced, especially visible on cloth over shoulders which are empty and not round like in higher relief. Interestingly enough, but understandable, only circulation pieces are such, with P/L, proof and BU sets being the older type, more plastic and undoubtedly visually more appealing.
For the 50 cents coins here - they are indeed different by the definition of SCWC, exactly the same way as all other denominations. However, I found here: The KM#37.2 is no longer on this page, since it was NOT defined as this: "Recut die, low relief". I would really like to learn more about that.
Rope is another variety on proofs, but circulation pieces are indeed different.










