It will detract from value if the signature is "touched up."
Given it is a postcard, non-spacesuit pose and it has a touch-up of unknown origin, I don't think it's worth more than $700. It may go higher than that, but you would have a hard time moving this down the road.
It does not match any published autopen patterns. Plus, the varying pressure is completely uncharacteristic of an autopen. It is certainly not an autopen.