Victoria reigned for about 60 years and there were about a dozen different coin denominations struck so you need to be a lot more specific. Please post a new question with the coin's date, denomination, and condition.
Please check your coin.
Queen Victoria died in 1901.
Queen Elizabeth II would appear on a 1986 Penny.
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Check your coin again. Queen Victoria died in 1901.
Such a coin does not exist. Queen Victoria was not born until 1819 and did not become queen until 1837. King George III was on the throne in 1800.
I imagine this to be a coin set in a mount on a ring, but the description is incomplete. If it is a coin it is probably a sovereign. Modified coins have no collector value.
Such a coin does not exist. Queen Victoria died in 1901. The legend "Victoria-dei-gra-britt-regina-fid-def-ind-imp" does not help identify a coin. It could appear on any British or British Empire coin issued from 1838 to 1901. You need to describe the design on the coin, the metal it appears to be made from and the diameter. Coins dated 1951 would have George VI on them. If you do indeed have a Queen Victoria "coin" with 1951 on it, it may well be a souvenir token commemorating the 50th anniversary of her death.
At the very least, it will be worth the current bullion value of whatever gold and silver was used to make it. Presumably there is a coin on the chain. Whatever collector value the coin may have had was lost when the coin was modified as a piece of jewellery.
That motto is on ALL British coins so it doesn't help to ID a specific coin. Please post a new question with the coin's denomination and an estimate of how worn it is.
"Victoria dei gra britt regina fid def ind imp" appears in one form or another on all British coins issued during Queen Victorias reign. Sometimes half of the legend appears on the reverse of the coin. The "IND IMP" was added to coins around 1893 when India became part of the British Empire. What does your coin appear to be made from? Are there any dates on it? What is the diameter of the coin? What are the three initials? Does the side with the initials have anything on it other than the initials? It is possible that your coin is a military medal, a medallion or a token.
A Victoria Dei Gratta Regina 5 cent coin is worth anywhere from $10 to $20 dollars. The price is determined by the year and condition of the coin.
TB is the initials of the designer (Thomas Brock) of Queen Victoria's image on all British coins from 1885 to 1901. Victoria dei gra Britt Regina fid ind imp is the Queen's full title in abbreviated Latin. What type of coin is it? What is it made from? What is it's diameter? What is the design on the reverse?
You are the second person to ask about an Australian coin that, in theory, should not exist. Can you provide any more detail about your coin?
What you have is a British threepence from the reign of Queen Victoria. The legend on the coin reads in English, Victoria, by the Grace of God Queen of Britain, and what you says is PD should actually be FD, short for Fidei Defensor, which translates into English as Defender of the Faith. When it comes to value, in average condition it goes for $1-10 depending on demand and condition. It really isn't that sought after, but it is sterling silver which gives it most of its value.
There were no Australian (or Western Australian) Pennies minted prior to 1911. An image of Queen Victoria and the inscription VICTORIA DEI GRA BRITT REGINA FID DEF IND IMP (Queen Victoria, by the Grace of God, Queen of the British Territories, Defender of the Faith, Empress of India) or similar, would have appeared on the obverse of any official British coin minted in 1896. What you may have is a Traders token or a medallion. The reverse may have a business name and address on it or, some sort of commemorative inscription.