That's a part of numismatics that fascinates me. 1988 is a low mintage, attractive, distinctive unique design. So we all hoard it and in 100 years time, because we have looked after them, people say "oh not another one of THOSE" Meanwhile a 1983 in BU probably is as rare as rocking horse poo. Pennies are my thing, and it seems to me that it is rather harder to find a 1915 or 1916 in the best condition, yet the mintage figures either side are 1913:65m, 1914:50m, 1915:47m: 1916:86m, 1917:107m, 1918: 87m inc H. I don't know if anyone else has found the same to be true ? But for me the interesting thing is that I reckon all the people who would have hoarded '15 and '16's were busy on the battlefields of France, or times were too tough to put a penny aside, so nearly 100 years later, they are rarer than their mintage figures suggest they should be. And that is before one considers subsequent reclamation and meltdown. With the £1 it's harder, increasingly sophisticated fakes, re-strikes, copies, silver proofs, piedforts.... I don't know of course, and never will, but I'm willing to bet that the rarest £1 from circulation in 100 years time isn't the one with the lowest mintage ? The 1988 is the best though, comfortably.