England has never used dollars, only pounds and pence. Up till the 1960s coins were issued in now-strange denominations such as shillings, florins, half-crowns, etc. Please look for one of those denominations on your coin and post a new question.
Please check your coin again. All 1843 US silver dollars were minted in Philadelphia so they don't carry a mint mark, and more importantly the Carson City Mint didn't open until 1870. If your coin does have that date and mint mark it's either a genuine silver dollar that was altered, or it's a counterfeit. A knowledgeable dealer or appraiser would need to look at it in person to decide which.
No. The San Francisco Mint didn't open until 1854, a few years after the start of the California Gold Rush.
If it has a motto on the back (the banner saying in god we trust) then its a fake. If its magnetic its fake. If it has a ridge running all the way around the center of the reeded edge the coin it is fake. If the denticles are not all symetrical its fake. Lastly, a real 1843 silver dollar weighs 26.73 grams and has a diameter of 38.1 mm. Anything other than that is a fake.
A British 1837 Halfpenny, uncirculated and in absolute mint condition could fetch up to £250 GBP. If it has been circulated but still in good condition, it might fetch anything from £10 to £95 GBP. A reputable coin dealer will be able to give a more accurate valuation.
Numismedia lists the following approximate retail values as of 07/2010: Very worn condition - $234 Moderately worn - $312 Slightly worn - $372 Almost no wear - $1,008 Uncirculated - $2,220 to $85,630 depending on quality
British forces annexed Natal in 1843 when diamonds were discovered in the region. This discovery heightened British interest in Natal's strategic value and led to their annexation of the area.
British Archaeological Association was created in 1843.
There were no Indian Head pennies made in 1843.
In 1843, the value of a schilling would have depended on the country it was from, as many countries used schillings as their currency. For example, in Austria, one schilling was equal to 100 kreuzer. In Britain, one British shilling was equal to 12 pence.
A British 1843 sterling silver Groat (Fourpence)(QV), uncirculated and in absolute mint condition could fetch up to £135 GBP. If it has been circulated but still in good condition, it might fetch anything from £6 to £50 GBP. A British 1843 sterling silver Groat (Fourpence)(QV)(4 over 5), uncirculated and in absolute mint condition could fetch up to £190 GBP. If it has been circulated but still in good condition, it might fetch anything from £10 to £60 GBP. 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.
John Ross - British Army officer - died in 1843.
The first British Florin was issued in 1849, so it is unlikely that there would be a Half Florin coin minted any earlier. There was never a British coin called a Half Florin. If one existed, a Half Florin would be One Shilling.