The "Y" tends to be taller on this year. A heavy die polishing can thin the devices. So I think this common for the year.
Note LIBERTY in this image:
I know it is a doubled die on these images, but you can see the "Y" towering over the rest of the devices in that area.
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, I've completed an educational DVD of these. Ask if you are interested.