How much is a ten shilling coin worth ?
The only 10 Shilling coin I can find for The bailiwick of Guernsey is a diamond shaped one with rounded corners 1966 the 900th anniversary of the Norman Conquest. It has Queen Elizabeth II on the obverse and William the Conquer on the other. It was a circulating commemorative and is worth $1 to $5 depending on grade. The 1914 George V penny had a mintage of 50,821,000 and is worth about .50 cents in circulated grades. The 1968 coin is not old enough to have collector value. The last 2 coins I presume are from Great Britain for Guernsey never used that denomination in 1914 or 1969.