When buying Cavalry badges the following are give aways as fakes: KDG - The 1898 to 1915 pattern - a very common copy but the fakes come with 2 lugs on the scroll (rather than at chest level or on a slider)...
Do you have a British coin, which was used in circulation, and do not know if its rare or not? Below is a guide on the very rare and expensive (Price over 100 pounds for FINE condition) British 19th and 20th...