@earle42 apologies for being a pedant (but then, why even get into errors and varieties if you aren't at least a BIT of a pedant), but, while MD is still a worthless form of doubling, it is an error under Mike Diamond's definition of occurring before the coin leaves the striking chamber for the final time. I believe he's even weighed in on this in a past thread and come down on the side of it being an error, just not a collectible one of any monetary value.