1945-P. When I found it I had no idea what it was. I thought it could be a die subsidence error. Feeder finger damage never crossed my mind. Here is the original thread. It's a pretty good read with some examples. http://www.lincolncentforum.com/forum/showthread.php?38206-1945-Wheat-Die-Subsidence-or-Soft-Die-Error-possible&highlight=Feeder finger It happens after the die was made, during the coin striking process. The way I understand it, the feeder finger scrapes the anvil die (almost always the anvil die) while feeding planchets into the striking chamber. I am not sure why or how it happens though. I would think the feeder finger would have to be damaged or bent in some way. I know @mikediamond or @Fred Weinberg can give a few details when they stop by. They are two of the most well respected experts on errors. I'm much more comfortable trying to explain die varieties.
Problem is todays horizontal striking presses don't use feed fingers or at least not around the dies. Something has scraped across the die but how and when I don't know. It definitely isn't a planchet flaw because it is strong in the fields and absent on the devices. A planchet flaw would show just the opposite. The field of the dies would have flattened the marks and they would have remained in the devices where the pressure was lower.
The 1945 cent shows a form of die damage found in cents from 1917 - 1945. These are usually bilateral and take the form of dents, areas of accidental die abrasion, or a combination of the two. As for Schuler presses not using feeders/ejectors, the coins themselves suggest otherwise. Many recent off-center multi-struck (and the occasional single-struck) coins show "foreign object chain strikes" representing coins struck against the cancave edge of the feeder. The same coins show "machine part impingment" errors, in which the edge of the coin is pushed in by what is apparently an ejector as it's pinned between the dies.
I obviously need a better understanding of how the horizontal Schuler presses work. The vertical presses I understand. The fingers slide across the top surface of the collar and drop the planchet into the coining chamber. But in a horizontal press there or nothing to make the planchet drop into the collar/coining chamber. How does the planchet get into the collar coining chamber?