The new design British general circulation non-commemorative coins issued since 2008 have parts of the Royal Shield on them which, when placed together, show the Royal Shield (with a few bits missing).
These coins include the 50p, 20p, 10p, 5p, 2p and 1p coins.
The One Pound coin shows the full Royal Shield.
In 2008, all British circulating coins had a redesigned reverse. When one of each of the six "Pence" coins is arranged correctly, the composite design shows the Royal Shield. That part of the shield visible on the Penny coin shows the bottom left part of the shield representing England, and the top left part of the shield representing Northern Ireland.
In 2008, all British circulating coins had a redesigned reverse. When one of each of the six "Pence" coins is arranged correctly, the composite design shows the Royal Shield. That part of the shield visible on the 2 Pence coin shows the "Lion Rampant" from the Royal Banner of Scotland.
The British 50 Pence to 1 Penny coins when properly arranged, show the Royal Shield. The One Pound coin shows the entire Royal Shield.
Dating back to about 1797, the predecimal British Penny had the iconic figure of Britannia, in one for or another, on the reverse. Since the introduction of the decimal British Penny until 2008, the reverse has had a crowned portcullis (gate) on the reverse. From 2008, all British coins had a new design for the reverse and when all of the "Pence" coins are suitably arranged, combined they show the "Royal Shield". The current Penny shows part of the shield indicating part of the England and Northern Ireland shields.
Various British coins dating back hundreds of years have had a shield of one type or another on the reverse. The only current British coin to have a full shield is the new design One Pound coin first issued in 2008.
The most famous shield volcano in British Columbia is Mount Edziza. It is located in the northern part of the province and is part of the Tahltan Highland. Mount Edziza is known for its large volcanic caldera and diverse landscape.
The reverse of the new British Penny shows part of a composite design depicting the Royal Shield which is able to be seen when one of each British denomination coin is positioned correctly.
British coins are different from all other coins because they are British coins. The coins of all countries need to be different so that we can tell them apart. What is legal tender in one country, is not legal tender in another country.
There were sufficient 20 Pence coins in circulation already. Some 1986 20 pence coins were issued as part of Royal Mint sets, but these were Proof FDC coins not for general circulation.
Saltire is a "heraldic" term and refers to a diagonal cross on a shield. This is often seen on old British coins where the shield may be a cruciform shield and the saltire a cross of sceptres of perhaps even swords, pikes or tridents. The term comes from 14th century Old French "sauteour", being a cross-shaped barricade.
The reverse designs of British One Pound coins are changed annually on a rotating basis since 1983 when they were first issued. Since 2008, the standard issue reverse design is that of the Royal Shield.
No 1747 British coin, or coins from that period, match your description. British coins would have an image of George II and would be made from copper rather than bronze. British coins from this period with crowned shields or cruciform crowned shields were made from gold or silver. It is possible that you have a privately minted token or a medallion. Is there a legible inscription on the coin?