All pre-1920 British Sixpences were made from sterling silver (92.5% silver content).
The silver content of the 1981 British Royal Wedding commemorative general circulation crown is zero. It is a cupro-nickel coin. No British general circulation coin has had any silver content since 1946. The 1981 silver Proof FDC Crown coin which was sold in a case, has a 92.5% silver content.
All British sterling silver Crown coins from 1887 to 1902 inclusive are 38mm in diameter and weigh 28.35 grams.
Which british?
There were 26,977,000 British 1902 Pennies minted.
Because the coin is not a silver eagle, with a date 1902 the coin is a MORGAN dollar. The first Silver Eagle was made in 1986.
British Academy was created in 1902.
A British 1902 sterling silver Crown (Five Shillings)(Edward VII), uncirculated and in absolute mint condition could fetch up to £265 GBP. If it has been circulated but still in good condition, it might fetch anything from £60 to £175 GBP. A British 1902 sterling silver Crown (Five Shillings)(Edward VII)(Matt Proof FDC), uncirculated and in absolute mint condition could fetch up to £225 GBP. NOTE - The 1902 British Silver Crown was the only Crown coin minted during the reign of Edward VII. 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.
1902 and 1907 silver dimes
If you mean a 1902 or 1903 British Penny, nothing, they are identical other than the date. The big difference is between 1901 and 1902. Queen Victoria was on the obverse of all British coins pre-1902. Edward VII is on the obverse of all British Pennies from 1902 to 1910. The reverse of all British Pennies from 1895 to 1910 used the same reverse die.
British Fencing Association was created in 1902.
British Homeopathic Association was created in 1902.
British Brothers League was created in 1902.