The Ruben Dario 50 cordoba gold coin is one troy ounce of gold, and has a minimum value of the current spot price (check KITCO for spot price). In spiffy condition it may be worth a slight premium over spot. If graded and slabbed by NGC it could be worth up to 20% over spot.
Please check your coin. The Centenary of Melbourne was in 1935. The Australian 1934/35 sterling silver Florin commemorating the Centenary was sold to the public in 1934 and 1935.
$20.00
If you refer to the packaged "Centenary of Federation medallion" given to school children, probably not much since there were over 2 million issued. They are a "Collectible" and value will incease over time. If you refer to the "Centenary of Federation medallion" included as part of the 2001 Proof set of coins, it will be worth nothing without the rest of the set.
40 us
Less than 15 cents.
Whatever you can get for it highest price paid on ebay £5.50
Ill give you 10p and a couple of panini 2006 swapsies
A Centenary of Newcastle (1797-1897) silver medal/medallion, depending on condition, could fetch anything from $10 to $50 AUD. A reputable coin dealer will be able to give a more accurate valuation.
The Turks Caicos Islands 50 Crowns Winston Churchill Centenary coin is not worth any more than its gold bullion value (there is no real collector premium). Since it contains 0.1447 oz gold, and since gold is currently trading at (approx) $903 per oz, that would make its current value about $131.
1,ooo,ooo pounds
3,829 of these sets were released - they sell via online auction for anywhere between $50 and their catalogue value of $95.
Less than 15 cents.