1858 10 Cents "Shark Fin" Die Clash, Die Crack

Strong error, and the coin looks in great shape, too. I agree with kuh_85 -- that's a nice one, Terry!

Terry I have an 1858 with a similar shark fin look but it's orientated more towards 12 o clock and it points to the middle of the T and the die crack on the reverse, goes through the bow on the right. Hope the makes sense I'll try to post pictures later.

Both your coins have die cracks.
Quite common.
Adds to interest but not value.

Don't put that dime away yet. Sometimes die cracks can be markers for other things going on on a coin.
The coin I showed in the original post has a die crack exactly like one you show. I bought that coin in an ebay auction with unclear photos (crack apparent but letters on the obverse were too blurry to be sure so took a chance), because I already had one with the same crack, which just happens to have the DA of CANADA doubled (Charlton 2011, pg.43). Sure enough, the second one does have the doubled letters (although its ADA, plus the D in DEI, plus the first A in GRATIA on both coins).
Check your coin if it also has the doubling. One of mine has the die clash "shark's fin", the other doesn't.
The doubled DA is also on the 8/5 variety which is worth mucho bucks. It seems there is a different die crack that is the marker for that error/variety.

While it does have the crooked D in CANADA, it doesn't look like it has the doubling. What does the obverse on the other coin look like ?

Nope, no double letters that I can see. Check under the TI of GRATIA - may be an illusion but it could be another shark fin.