That 1820 is a clear VF I'd say - a nice coin. You could do a lot worse than major on halfcrowns - as long as you don't go in for date runs, they will be generally cheaper than crowns, but are still a good size for seeing detail. For types : going forward, there are Victorian Young Head where you should avoid anything before 1874 in a good grade as they will empty your wallet! One from 1874 - 1887 in GVF should be your target (unless you can afford to bump up to EF?) Victoria Jubilee Head : 1887 in EF up to BU Victoria Old Head : 1893 in EF or better Edward VII (difficult reign) : 1902 is far and away the most affordable George V .925 silver : 1915, 16, or 18 minimum EF George V .500 silver : 1920 or 1923, but minimum EF as the head flattens very quickly on that type George V M.E. : 1927 George V new reverse issue : 1928, 29, or 36 in AUNC or better George VI .500 silver : 1944, 45, or 46 in BU George VI CuNi : 1948 BU George VI last issue : 1949 is arguably the easiest Elizabeth II : 1953 BU Elizabeth II 2nd type : 1966 or 1967 in "Gem BU"! Oh, I forgot to mention the other 'machine age' types you don't have: George III 'Bull Head' : minimum VF George III Small Head : ditto George IV 2nd type : 1823 VF or better George IV 3rd type : 1826 VF or better Those are the main types to collect, and the easiest dates to find. Does the same apply to shillings?