Sir, ever Sense you told me about the re-engraved die variation I remembered that I had thrown a 1937 Lincoln Wheat cent into my error tube like a year ago but just thought it was PMD until we discussed this on the forum!
It took me a while but I dug it out of the tube and it's is similar to what you described.a die being cleaned out or an employee re-engraving a LWC! I say that because this would be so hard to do at the level this 1937 is done without any errors outlining Lincoln! It does not have the enlarged dot or the highlighted left wheat stalk but the deep groove all the way around Lincoln is where my curiosity is about the re-engraving or die cleaned of grease causing a deeper detail on a Lincoln's outline? You tell me if this is PMD or Re-engraving? I know the coin is a mess but haven't Acetone it or anything yet?