Hi I have a coin that has a pocket knife built into it. There also is a nail file. It used to be on a broken key chain, but I took it off and put in on a chain. I think it is dated 1900, (there's a stud blocking the 4th digit). It is not a US coin. here are the pictures; there are 4 so just hit the next button. http://picasaweb.google.com/cp7642/Coins#5412346091997437474
As a coin? Next to nothing. As an interesting knife? I don't know, but I'd happily pay ten or twenty for it, if I were in the mood.
http://cgi.ebay.com/Very-Nice-Eloi-...emQQptZLH_DefaultDomain_0?hash=item27ad7ef01e or maybe you could make your own from this http://cgi.ebay.com/Vintage-Coin-Ty...emQQptZLH_DefaultDomain_0?hash=item3a556b1582
Here's mine......I love it: http://www.cointalk.com/t52607/ And if you read the thread I posted, there are some links on others for sale.