Watch List notes:

Elizabeth II (1952-), Double-Reverse Mule Two Shillings, 1967, edge milled, 11.08g, 12h (Spink 4149; ESC 4433 [968U]), perhaps a trial striking in nickel prior to the introduction of Decimal coinage, otherwise much as struck and an extremely rare mule, with only two or three known, in NGC 'Francis' holder, graded MINT ERROR ~ MS65 (Cert. #5878644-015)