Of the three, Michael Gouby rates the 1869 as scarcer than either the 1875H or 1871, which he sees as being roughly equal. Michael Freeman sees 1869 and 1875H as equally rare and considerably rarer than 1871. Impossible to tell really from any of our limited experience, but all I would say is that 1869s seem to create a bit more of a 'stir' than the other two. Looking again at Freeman's original book where he gives numbers he found in circulation 1869 13 1871 53 1875H 19 David