Problem being Peter is how old the books on CD are, they price guide could be well out of date as i've recently witnessed on a Spanish 8 reales i had, krause had it down at $100 in its grade, i sold it for £290, needless to say i've bought 1601-1700 and 1701-1800 Brand new a few weeks back so i hopefully don't make mamy errors on any other World coins i may sell in the future. I reckon buying new every 5-7 years should keep you in touch with prices (just)