Dates and mintmarks are needed, post new question.
What specific Lincoln coins minted in the 1940's did you have in mind?
The value of the Lincoln Memorial Cents minted from 1959 through 2008 in brilliant uncirculated condition is worth approximately 15.00 for the business minted coins from Philadelphia, Denver, And San Francisco... If you also have all of the proof coins issued from 1968 through 2008 you could probably add another 75.00 to 125.00 more in value to the collection... In 2009 the Lincoln Cents depicted 4 different reverses for the life of Abraham Lincoln...and in 2010 the Lincoln Cents changed their reverse to a Shield...and that will be continued until further notice...
ALL us minted coins by stated value for a given year
If you have the entire collection of coins that were minted that year and these coins are all in uncirculated condition, the value ranges from $8 to $12.
Halfcrown coins were never minted in Australia.
Lincoln pennies weren't minted until 1909.
Not for general circulation as the metal is far more valuable the the face value of coins being minted, however silver may be added to very special commemorative coins.
$10.-$15. depending on how worn it is.Note that bills are printed. Coins are minted.
One cent.
There were no dollar coins minted that year.
There were no Australian coins minted prior to 1911. With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" coins minted prior to 1910. The only coins circulating in Australia prior to 1910 were British coins.
The US has not minted any Ronald Reagan coins. There are plans for a one-dollar coin in about 4 years. The US mint has minted bronze medals for Reagan that resemble coins but have no face value. Some foreign countries such as Liberia have minted Reagan coins mostly to sell to Americans at more than face value.