Hi Relaxicab & everyone else. This is my first posting on this site, and this question seemed a good place to start! NumismattyUK explained about the medal alignment after 1887, and I'm sure this date should be coin alignment. It all depends on the direction of the spin. The Victorian shillings between 1839 and 1863 were all coin alignment rather than medal, so if you spin it north to south (top bottom) it should show both sides the right way up. If it's like numismattyUK explained, then I guess it's unique/rare.
As for beginning to understand the values of what you have, I recommend you get a good book such as the most current "Coins of England & the United Kingdom" published by Spink. This is one of the bibles of UK coinage, costs about £25, and the 2009 edition should be hitting bookshelves in the next few days. As long as you have a lot of UK coins to sort through, I think you need to treat yourself to an early Xmas present!