silver
Platinum metal looks like silver but is heavier than a coin. Platinum is equivalent in color to silver. The platinum is also heavier than the silver itself.
Please check your coin. The 1837 gold Half-Sovereign coin had the "Crowned Shield" design on the reverse with William IV on the obverse. The St. George design first appeared on the Half-Sovereign coin in 1893.
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it looks like a silver coin with 100 on it
It looks like the coin in the related link:
Half sovereign - British coin - was created in 1544.
For automated coin changing I believe the first ones were the British sovereign coin changers. They first came out in the late Victorian/Edwardian era (I know for sure that one was patented by John Cox in or before 1907). These early machines would let you put in a gold sovereign or half sovereign and recieve change in smaller silver coins.
The only British 22 carat gold coins issued in 1899 were the Sovereign and the Half-Sovereign. The Florin was a silver coin from its introduction into the currency in 1848.
It looks like the back of the coin, with a real big eagle.
An uncirculated coin is one that has never been in circulation. It looks like it just came straight from the Mint, ie. in mint condition.
No. The British gold Guinea coin was a coin with a value of 21 Shillings and was 24mm in diameter. The Guinea was last issued in 1813 and was effectively replaced by the Sovereign. The British 22 carat gold Sovereign coin is a coin with a face value of One Pound (or 20 Shillings) and is 22.05mm in diameter. The modern Sovereign was first issued in 1817.