Good morning.... I hope I'm not just seeing things but does the Lincoln on the 1937 seem to be smiling? Also his eyes don't seem right. Is he stoned? Lol. I don't see anyting wrong with the other coins
Nothing is different. I am not aware of any Master Hub change in 1937 and it certainly doesn't make sense to change for 1 year and then change back. The master hub goes for years without being updated. As far as I know, the original Master Hub was used through 1968 before it was updated (look at the difference between a 1968 cent and 1969 cent)
one too many late nights. For Lincoln, and maybe yourself. lol a nick, scratch, change in color stains, etc.
probably because the rest of the surface is well damaged. Not any heavy hits and such but first, did you notice the inconsistent discoloration ? have you noticed the small nicks all over the place? Just above the eyebrow is one big long vertical hit. Also, the pictures are not clear enough to see all the detail of the surface to make much conclusion.