i found this on the ground the other day and it kinda looked to me like a black beauty nickel but its a 1968 d so i really dont know.. if you have any ideals what this is it would really help... and there is a pic of a 1938 nickel i found in circulation a while back thanks bob
http://www.cointalk.org/showthread.php?t=16509 read through this thread and you should find out what it means
Unfortunately, it does not look like the nickel you found is a so called "black beauty," as your coin appears to have its color more as a result of circulation and dirt than from toning. The "black beauty" nickels are usually nice uncirculated examples (often proofs) that have a pretty, dark toning. The 1939 Jefferson Nickel is worth about $0.50 retail.
Here's another discussion,with pics of MY black beauty...hehe http://www.cointalk.org/showthread.php?t=10294