rittenhouse

Don't think The History Channel is correct on this point. While certain applications requiring a very tight bond still use explosive bonding, cupro-nickel/copper clad is produced by roll-bonding. See www.cladit.com If I recall correctly, the reason for the clad was to maintain the electromagnetic properties so coins would still work in vending machines.

OK, missed it. Value maybe around $75 with the solder spot. Do a search on eBay. Not rare or hi value. I wouldn't bother fixing it, just eBay it.

As a former engineer in the metals industry, I've been following this thread with some interest. FWIW, I would not try any of the methods suggested. I also would suggest you not "play with the solder". If you don't know what you're doing you will ruin the coin. This may not matter since you haven't revealed what the coin is (gold, silver, copper) and the piece may be of low value. If it is and you don't mind the likely outcome, go for it. Otherwise either leave it alone or send it to the pros - Stockton or NCS. They have the techniques to do this properly with the edge going to NCS.