in-collar uniface strike im lazy today so ill post this with mike diamonds comments. not a capped die as i originally titled it. http://www.cointalk.com/showthread.php?t=130565&p=1000818&highlight=#post1000818
In my opinion, it is considered an error because the reverse die was accidentally paired with the obverse die, which is more like a mule, which happens to be classified as an error.
A Couple of my favorites in-collar uniface strike against a split planchet (striated side of the latter pointing toward the obverse die) 1984 LMC Die Clash Obv and Rev
Stewart, That's a nice clash. Looks like you might have ADC-1c-1984-03. http://www.maddieclashes.com/ADC-1c-1984-03.html
Jallengomez, Thanks for that information, I am going to have to dig the coin back out and do some comparison Terry