Here is a normal cent reverse for 1968. The "U" is normal shape that years reverse.

Your coin is a later die state, which is showing die wear on the tops of the devices on the reverse. Note in your last image you can see where the die is aging and the tops of the devices are flowing to the rim. here is an image that shows the gradual breakdown of the devices like your coin.

Note how the edge of the devices near the rim got from rounding in MDS to VLDS even breaking down more than your coin. Dies are like us, they age/show breakdown over time.
So what is your coin worth. I'd say what the copper value is. Sorry

Your coin is a later die state, which is showing die wear on the tops of the devices on the reverse. Note in your last image you can see where the die is aging and the tops of the devices are flowing to the rim. here is an image that shows the gradual breakdown of the devices like your coin.

Note how the edge of the devices near the rim got from rounding in MDS to VLDS even breaking down more than your coin. Dies are like us, they age/show breakdown over time.
So what is your coin worth. I'd say what the copper value is. Sorry














on the REVERSE , the first thing that popped up was the U in "UNITED"












