Check out this cud in the first (9). I've seen and have plenty 1957-Ds but this is the first 1955-D. Bone
A piece of metal which appears on a coin when the die is damaged. (Like a cookie cutter with a notch in it on top of Santa's head and your making cookies. The final product looks like Santa has a blob on his head insteadd of his cap) Look at the (9) in the date. B