The value of a George VI half crown coin will depend upon its condition and how much the seller wants for it. You can expect to pay anything in the region of $1-$30 for this coin at auction.
No US coin, including the half dollar has a crown stamp on it when it comes from the mint. Instead, if you have a US half dollar with a crown stamp in it, it was done either by a private company or individual. These stamps generally add no value to your coin and it is just worth what a damaged example of whatever year of half dollar you have is worth.
The value of a 1929 Half Crown coin can vary depending on its condition, rarity, and demand among collectors. In general, a circulated 1929 Half Crown may be worth around $5 to $15, while a well-preserved specimen could be valued at $20 or more. It is recommended to have the coin appraised by a professional or check recent sales to get a more accurate estimate.
The 100 ptas coin is a Spanish coin. The British Halfcrown coin has a face value of Two Shillings and Sixpence. To get a valuation on either coin, you would need to provide the date and condition of the coin.
The more common name for the leathchoróin is the Ireland Half Crown. The 1951 edition of this coin is valued from $1 for a worn coin to $5 for a fully uncirculated coin.
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An alderman is a member of a variety of municipal legislative bodies in a city or town, or a slang term for a half-crown coin with a value of 30 pence.
It's impossible to say for certain, as the question omits the coin's denomination. A silver coin for that year could be a threepence, sixpence, shilling, florin, or half crown.
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The coin is only face value.
The design on the reverse of the Half New Penny coin was a crown.
The half-crown and crown are obsolete British coins. Under the old pre-decimal system, one crown was worth five shillings, and the half-crown was worth half that. At twenty shillings to the pound, the crown was 1/4 and the half was 1/8 of a pound. Or, the crown was 60 pence and the half was 30 pence.