LOL, Nick, just realized we have similar interest and even names are similar! I haven't reached this level yet - we will see. I am trying to find a good database of numismatic data for 1800 onwards UK coins (e.g. good solution picture with details explained, weight, size etc.), seems there is none I had to combine information from http://www.coins-of-the-uk.co.uk, http://coinsgb.com and also our http://coinsgb.com I think I will end up making own database or webpage soon... maybe I missed some good websites? BTW, if admin can see this, the forums 'read first' post has invalid links to grading etc. The weights of silver coins are pretty easy to remember (or at least to work out). All you need to remember is that a crown nominally weighs 0.9090 troy ounces and the others can be worked out from that (halfcrown = 0.4545, florin = 0.3636, shilling = 0.1818 etc). Then you'll probably need to convert troy ounces to grams which is multiply by 31.1034768.