1964 D Roosevelt Dime Spiked Head With Reverse Clash

The mark behind the head looks to be from die damage but not a die crack.
Something got between the die and a planchet on an earlier strike and impressed that mark on the die.
Thereafter dimes struck from that die would have that mark.

I agree that the reverse suffered a die clash.
Look at the heavy die scratches in the field areas from 12 to 6.
Also notice that there's no apparent scratches on the devices which pretty much says the coin wasn't abrasively cleaned.
Points to the die being re-polished at the Mint.

Good eyes. That's a neat find that would probably be misses by a lot of folks - me included.

I have a few rolls of unc 1964's and some time on hand so I looked through them. Konga what's the difference between these one and the spiked heads in COC where I already have a Mercury dime listed?

Looks like a nice Crack N Clash to me. Nice find!

thanks CoinMasters and Coinfrog

Great spiker and clash. JC is going to have a handful when he comes back