The following picture shows a coin that I purchased with a group of indian head cents. I did not think too much of it at the time, but as I usually do when I have a 1909 VDB coin, I put it under the microscope to double check for an S mint mark. I was quite suprised to find that I had a double date 1909 VDB. I would rather have had the S mint mark since that would have filled in a slot in my set, but I thought that this was quite a different item. The moral of the story is, be sure to check out all of your coins even if you don't first see anything unusual.