What Type Of Error Is This 1977 D Dime ?

I see after strike damage to the coin on the Reverse. The observe show some clad broke due to the strike on the Reverse. Sorry it is just an Damage coin after strike.

Those circles often are caused by coin wrapping machines but that one looks as if some vandal deliberately hammered a metal tube into the coin.

that sure looks like damage (Intentional)

Ok. So you think the die breaks on the front are nothing to check into ? As well as the design misprint on the back? I can't see how a coin roll machine would take away the letters on reverse or change the imagine. Am I missing something here? If so , please educate?
The opinions here are sometimes totally different from other sites. Newbies like me are easily confused by this. I understand you are simply looking at a pic that may not have the best quality when we post here and that may be something I need to work on. I have coins missing letters , some the full words are missing , as well as some with pic patterns missing. I usually seem to get the same response here. My error , after mint damage ( mine or someone's it seems ) , weather/chemical damage, I have to wonder how every coin I post to learn about here is well, junk. Not to be rude but I think if anyone could post a link with their reply to help us to learn what they say it is would be wonderful. I'm not hunting an easy road for info. I will read any think I'm given to learn. Surely , if you feel strongly that you know the damage then you have either had this issue in your coins or at least seen it and looked for info yourself. You don't need to go find articles to post links , just tell me what to search Google for and I will be looking. Maybe I'm different , but I would love to find articles with other pics to compare. I want to learn all I can.
Thanks to you all

The reverse was smacked with a cylinder. The impact was so forceful that the obverse cracked. This is post-strike damage.

Dreamin_Sqaw,
OK,The two TOP dogs just gave you their opinions...now what?
John1

Dreamin, this is a good place to learn, there are plenty of prior threads with great info.

In general, any odd coin appearance that can be replicated fairly easily with a few tools is regarded as post mint damage. Start with an undamaged dime, a piece of wood to place it on, a sturdy metal tube, and a big hammer, and anyone can make another coin that looks much like yours.

It is important to learn that not every coin is an error coin. Take sometime to educate yourself as how coins are made. It will make it to easier to spot the unusual variety or error coins you may come across. You could look through thousands and thousands of coins and never find a true error coin or variety. Read and study and learn about coins before you jump in head first. Bonne chance!