That's a legit double clip, all right. Or more accurately an incomplete planchet. The telltale signs are the tapering rims near the clips. A phony would show grinding or file marks in these areas...
A few characteristics make this a great find:
- Clips on large coins are uncommon
- Clips on large silver coins are even more uncommon
- Double clips on large silver coins are more uncommon still!
I'd say you have at least a $50 find there. Congrats!