Lincoln penny mint error or hand crafted?

[pok8herc]

I was out metal detecting and found this penny. Its hard to tell from the pictures but it looks to be a 1918 wheat penny, not in great shape. What is interesting and has me a bit confused, is the reverse side of the coin isn't there and it appears to be hollowed out. Has anyone ever seen or heard of a mint error like this, is it a fake, or perhaps is it hand crafted? I can't see any definitive signs of tampering, but on the inside surface of the reverse there appears to be uniform circles/riffles that I'm only guessing might be from the stamp when minted. Any input is helpful. Thanks

 

[Diggin-N-Dumps]

Looks like half of a trick coin (magicians coin)

 

[vhs07]

half of a two headed penny?

 

[recondigger]

Reminds me of that spy nickel I saw on TV they could hide micro film in it

Dig until your arm falls off

 

[pok8herc]

Ahh, that's what it is then. Makes sense, and now that I use that info to do a search I'm finding more info on it. Thanks everybody!

 

[nsdq]

that is neat