A British 1757 Sixpence, circulated but still in good condition, might fetch anything from £10 to £90 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
NOTE - The reverse of these coins is upside down to the obverse. This is normal.
The Sixpence was not introduced into the currency until about 1550.
Probably nothing. Modified coins have no collector value.
A Sixpence was a small predecimal British coin. Half a Sixpence was a Threepence, an even smaller predecimal British coin.
All British 1935 Sixpences were minted at the Royal Mint London. There are no "D" Sixpences.
The British Sixpence was known as a "Tanner". The Australian Sixpence was known as a "Zack".
Yes. If you are hoping to increase the collector value of the coin, any cleaning process you might use will only damage the finish of the coin and remove precious metal.
A British 1700 Sixpence, circulated but still in good condition, might fetch anything up to £1,350 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Halfcrown is the eqivalent of Two Shillings and Sixpence. A Crown was Five Shillings.
The Royal Mint did not produce any Sixpences from 1752 to 1756 inclusive.
Good luck if you have one, but the last British Sixpence was minted in 1967.
GRI (not "GRJ") on the reverse of the 1937 to 1946 British Sixpence is an abbreviation for George Rex Imperator.
A British Sixpence in 1805 has the purchasing power of about £1.40 GBP today.