I believe the missing period version usually (always?) has the slightest hint of a faint period there, but your pictures seemingly show an obvious period appearing. It's definitely a bit of a gray area, and it's always possible that the graders got the slab wrong??? Here's one from COMC where you can (especially when enlarged) make out the hint of a period...
Haywood-Sullivan-(No-Circle-Around-Copyright-C--No--After-A-in-USA).jpg