It depends on the type of threepence. A nickel-brass (multiple sided) threepence is rather common and would sell for 50p to a pound or so if circulated.
A silver threepence on the other hand is 50% silver (and much smaller) and worth about a pound or two mostly for the silver if circulated.
Please check your coin. Australia has never issued a 2 Pence coin and "NEW PENCE" was the term applied to the range of British decimal coins from 1968 to 1981.
Please ask one question at a time in the format "What is the value of a 1919 Australian Threepence" for example. Most answers already exist on WA.
For a full set of the three, they could be worth upwards of a dollar. That's a dollar for all three, not a dollar each. They're not rare, nor are they as valuable as many people believe.
The value of a 1943 three-penny bit, or three pence coin, can vary based on its condition, rarity, and demand among collectors. Generally, these coins are made of stainless steel and are not particularly rare, so they might be worth only a few dollars in average condition. However, if the coin is in excellent condition or has unique characteristics, its value could be higher. For an accurate appraisal, it's best to consult a coin collector or a numismatic expert.
They're not as valuable as most people believe. A set of three could be worth about a dollar.
a 1943 D penny is worth 1.7 million dollars
They are not iron but zinc coated steel. In the lowest grade they are worth about three cents. In the highest grade they are worth about $20- $40.
For example, a 1943 & a 1943-D coin in MS60 condition are worth: $5.00. A 1943-S coin in the same condition is worth: $15.00.
Assuming you have a British halfpenny, you have a common coin worth a few cents if circulated or a dollar or two if uncirculated. There are lots of commonwealth countries that produced half pennies in 1943 so some might be worth more, but off the top of my head I don't know of a 1943 half penny that is worth a lot.
The 1943 US pennies were steel, not platinum. Their worth depends on condition.
1943 12 sided Canadian penny
Three Smart Guys - 1943 was released on: USA: 23 October 1943