You can sell it on Ebay or Gumtree.
Although it's old, prices vary from cheap to expensive.
I have a 5 shillings coin 1652-1952 that I want to sell contact me on 0845773125.
You would need to know the condition and denomination (farthing, half penny, penny, three pence, six pence, shilling, 2 shilling, or 2 1/2 shilling) of the coin to be able to get an estimated value.
how much would a georgivs vi dei gratia rex 1948 quarter worth
It's impossible to say, because the question doesn't include the country, denomination, or date of the coin.
The Royal Mint issued no commemorative Shilling coins.
You are asking about the Five Shilling coin issued by South Africa in 1952 in commemoration of the 300th Anniversary of the founding of Capetown. The coin bears a portrait of King George the Sixth (of Great Britain) on the front and and an image of a Schooner in Capetown harbor on the back. The coin is 50% silver and has an ASW (Actual Silver Weight) of 0.4546 troy ounces. Numismatically, it is worth perhaps a dollar or two over the silver value in circulated condition, about US$12 in Uncirculated condition, and maybe US$15 or so in Proof.
You are asking about the Five Shilling coin issued by South Africa in 1952 in commemoration of the 300th Anniversary of the founding of Capetown. The coin bears a portrait of King George the Sixth (of Great Britain) on the front and and an image of a Schooner in Capetown harbor on the back. The coin is 50% silver and has an ASW (Actual Silver Weight) of 0.4546 troy ounces. Numismatically, it is worth perhaps a dollar or two over the silver value in circulated condition, about US$12 in Uncirculated condition, and maybe US$15 or so in Proof.
ALL British coins have that inscription so it really doesn't help to ID a coin. Please look for the coin's denomination and post a new question. Old British coins have strange values so you may see words like shilling, florin, farthing, etc.
one shilling and six pence
Such a coin does not exist. In 1909, the only coins issued by the States of Jersey were the One Twelfth of a Shilling and the One Twenty-fourth of a Shilling coins.
You are asking about the Five Shilling coin issued by South Africa in 1952 in commemoration of the 300th Anniversary of the founding of Capetown. The coin bears a portrait of King George the Sixth (of Great Britain) on the front and and an image of a Schooner in Capetown harbor on the back. The coin is 50% silver and has an ASW (Actual Silver Weight) of 0.4546 troy ounces. Numismatically, it is worth perhaps a dollar or two over the silver value in circulated condition, about US$12 in Uncirculated condition, and maybe US$15 or so in Proof.
The Australian One Shilling coin was replaced by a 10 cent coin in 1966 at Australia's conversion to decimal currency. The way currency and personal finances are currently heading in the early 21st century, there is not not much likelihood that Australia will reintroduce a One Shilling coin in 9411.