Sylvester said it was less than 1% of the total mintage, They are definitely rarer than the normal one. But how rare...? I've just googled it but found nothing
You know, the 1992 ones where the l and i in Elizabeth point to dots. I was out bowling, and afterwards we went on the game machines. I was on this gambling thing, and if you fired your 10p into one of the holes, you got loads more of them!!
Yes, that's probably part of the properties of being an extremely rare coin. But I think the mintage is more important than how often it comes up for sale.
IMHO don't get the 1773, as it will probably get bought by someone else before you save enough money. Get either the 1935 or the 1953. I voted for the 1953 cos it's extremely rare, and you may not get another chance to get one for a while. The 1935 will probably appear in that grade more often than the 1953 won't it?