Recently I have been taking closer looks at my coins and have been finding neat stuff. 42' machine doubling mercury dime. Can see MD in the date, L and B in liberty, chest of the portrait and MD in the motto. 79' cent. Almost all of the 79's I've been in finding in my copper jug, the mintmark is filled. My 29' mercury dimes all have the same die break/crack I suspect. This 64' Rosie I thought was a rpm but I'm no error guy. But I did notice the I in dime has a tooth going to the rim. Happy collecting yall!