Everyone is throwing numismatic terms at you - so lets start with a basic description:
A Cud appears on a coin when a portion of the die adjacent to the rim cracks, separates and fails. Then when the coin is struck the missing portion of the failed die fills with metal that should have been a part of the normal design.
Since there is only a fixed amount of metal in any planchet, the coins surface directly the Cud locations is starved of metal and always appears as a depressed surface.
Your photos are too small in size for me to see many of these details in strong resolution - but you should be able to see them for yourself.
Take a look at my other hobby ... http://www.jk-dk.art




















