1939 And 1919 Half Penny Errors

The '39 looks like is has a blank lamination defect, which seems to be quite scarce, for bronze Aussies contemporary with this one.
The lamination is usually the result of localized impurities in the blanking strip.

The weak lettering on the Blakemore reverses for
ONE PENNY and ONE HALF PENNY are a bit easier to find.
The reverse circumferential legends for these do not seem to suffer from this weakness, as exampled here.

Kafka:
The '39 'roo rev. is scarcer than the '39 Blakemore reverse halfpenny. Mintages 'roo: 780,000, Blakemore: 4.7 million.
Grade of yours: VF, cat value about $5 U.S.

The '61 proofs came from the Perth Mint.
Only 1,040 pairs were struck. Today, they cstalog at around $2,000 a pair. That's for perfect coins, without black spots.
Because of the commonly met storage conditions over the last 50 years, perfect Perth Mint proof bronze coins are very difficult to find.