There were only two types of British silver coin issued by the Royal Mint in 1787, being the Shilling and the Sixpence. At a glance, both coins are near identical in design other than diameter, the Shilling at about 25 mm and the Sixpence at about 21 mm.
Both coins were issued in a number of variants with minor differences, and both were issued as general circulation and Proof coins. Some of them are classified as extremely rare.
Any one of them has a sufficient value to make you visit a reputable coin dealer for positive identification and valuation. The higher quality coins have enough value to make you run to a reputable coin dealer for positive identification and valuation.
Your coin is either 1787 silver British George III Shilling or a Sixpence. The Shilling would be about 23mm in diameter, the Sixpence about 19mm. The reverse design is referred to as a "Crowned cruciform shield", each shield representing England, Ireland, Scotland and Wales.
Please check your coin again. The first US silver dollars were minted in 1794. You could have a commemorative coin honoring the US Constitution; if so it will have that information and an actual minting date on it.
Five Pounds, Ten Shillings GBP in 1787 had the purchasing power of about £515.00 GBP today.
The top date of 1787 makes it a Delaware, Pennsylvania, or New Jersey quarter, all of which were actually minted in 1999. The coin is worth 25 cents.
Brass tokens with the inscription "In memory of the good old days" were issued between 1787 and 1799. They typically have a bust of George III (British monarch from 1760 - 1820) on the obverse surrounded by the inscription "Georgius III dei gratia" and a Coat of Arms surrounded by the inscription "In memory of the good old days" on the reverse. Smaller pieces roughly the size of the half guinea are also common. There is some evidence that these tokens were restruck in the 1860's. They are quite common with a value of a few dollars at most, and it is possible to put together a quite attractive collection of spade guineas for a modest cost. Their exact function is not known, but it is quite possible that they functioned as gambling tokens in a manner similar to today's poker chips.
A British 1787 silver Shilling (George III)(No semee of hearts in Hanoverian shield on reverse), circulated but still in good condition, might fetch anything from £22 to £110 GBP. A British 1787 silver Shilling (George III)(Proof FDC)(No semee of hearts in Hanoverian shield on reverse) is considered to be extremely rare. A British 1787 silver Shilling (George III)(Plain edge - Proof FDC)(No semee of hearts in Hanoverian shield on reverse) is considered to be extremely rare. A British 1787 silver Shilling (George III)(no stop over head), circulated but still in good condition, might fetch anything from £35 to £175 GBP. A British 1787 silver Shilling (George III)(no stops at date), circulated but still in good condition, might fetch anything from £45 to £250 GBP. A British 1787 silver Shilling (George III)(no stops on obverse), circulated but still in good condition, might fetch anything from £275 to £1,750 GBP. A British 1787 silver Shilling (George III)(with semee of hearts on reverse), circulated but still in good condition, might fetch anything from £25 to £100 GBP. A British 1787 silver Shilling (George III)(1/1 retrograde)(with semee of hearts on reverse), circulated but still in good condition, might fetch anything from £45 to £300 GBP. A British 1787 silver Shilling (George III)(plain edge Proof FDC)(with semee of hearts on reverse) is considered to be extremely rare. The values quoted are the best possible for the best specimens in their grades, but may be significantly lower due to varying demand for the coin and the prevailing economic climate. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
Due to Britains ongoing expenses with various wars in the late 18th and early 19th centuries, there were very few silver or copper coins minted, subsequently there were a great many privately minted tokens and counterfeit coins produced. To get an estimate of value on a privately minted token, you need to provide the details of the inscription on the token.
The first year a US $5 dollar coin was struck is 1795
You can retrieve this information by going to the below indicated link. http://coins.ha.com/info/typevalues.php
if uncerculated, one could be worth approx. 36,500 Japanese yen. #YOLO
2009 - 1787 = 222
The US Constitution was written in 1787.