1979 Double Clip?

Looks real to me.

One thing I look for is the lighter strike that occurs at the clip. When a coin is struck the die is higher in the center and the pressure from the strike starts in the center of the planchet and rolls out radially in a circle toward the rim. As the pressure rolls out it causes the planchet which is slightly smaller in diameter than the finished coin to squeeze out against the collar. The collar causes the metal movement at the rim to stop flowing outward changing the direction to upward. Notice on your coin the bottom of the E in Cent, the metal didn't flow upward to completely fill it. This was because the pressure wasn't at the collar because of the clip. This is the type of thing I would expect to see on a valid clip.

It looks like it is the edge of the die. The die is slightly smaller than the collar so it is possible for some metal to flow up between the die and the collar giving the appearance of 2 rims. In extreme cases the extra metal flows high enough to give a high fin error. This can happen on one side of the coin for several reasons including a slightly tapered planchet or a vertically misaligned die. Something caused extra pressure on this side of the coin to give more vertical metal movement at the rim.