2000-D Lincoln//Doubling Or Damage

taking a guess here; you are referring to the inside, of the upper part of 'C'? .first just to clarify 'doubling and the term damage ' are interchangeable. they are the same.ie.they have the same meaning.just pointing this out;due to not long ago I thought they were different too.this knowledge helps when searching auctions!!!the term doubled die(s), describes that the die(s).which are used in striking the (planchet)thus becoming a 'doubled die coin'.thus,these coins have the collectible(valuable)doubled(die)devices.coins which have devices;that exhibit doubling. are considered damaged.due to the 'doubling' is not part of the striking process.there are two main 'types or forms' of MDD -mechine doubling damage.credit goes to alan herbert .who in 1973 determined; *using a microscope* that the most common form of doubling was/is damage.now considered valueless and much to common to collect.1st form of MDD;push doubling damage happens when a die bounces upon a struck coin.effects; a scraping down of one side[or read]top or bottom of the design device(s).leaves the 'flat' shelf-like metal along:'side of'[read](also location can be top or bottom) the design devices.*note not reaching down to the field of the coin.2nd form of MDD;'slide' doubling,as the die is moving away from struck coin,die slides (sideways into sides of design devices.thus leaving tapered effect on the devices,*note the rest of the device (unaffected top)will be are have dished / rounded kinda 'converggence'where the damage(slide) ends and the normal(unaffected)part of the design device is or (begins). your coins appears to be of the second form 'slide'MDD. see how the inner part of the upper 'C' starts thin near the field and increases(thickens)as it nears the top part of the device 'C'.