The 1943 looks like it took a hit from the edge of another coin early in its existance and the edges of the "hit" have worn and smoothed out over time. Hits by the edges of other coins will move the copper in the dates to merge with other portions of the date or to move it's location on the face of the coin. That is my call here.
The 1943 obverse looks like poor quality copper or poor milling for the sheet this cent came from. Looks like the sheet had a "wrinkle" in the surface from where the cent was punched out and when the die hit the wrinkle it left what you see. OR, something like the first comment where something dug into the coin and moved some of the copper to another location(notice the divit in the face).
The revese looks corroded like verdigris was on it at some time, scratched off, then wore and aged after that to leave the corroded spot.
Thats my two cents!
