I had to look pretty close to see it but.. I am seeing a separation line on the East side of the 4 in the date, and the mint mark. The 99 of the date has a little separation as well. It's subtle but many of the '90's ddo's on Wexler's site are too.
The line in the 4 looks like it's not a plating issue. Here is IGWT die deterioration? We is very wide? who knows? maybe you do..