Set of 4 B.C. Caveman Grog mugs

Milk glass mugs. By Johnny Hart. My guess is these are from the late 60’s, early 70’s. From B.C. Comic. Caveman on one side. Says Grog on the other. No chips or cracks. Couple minor spots and one has some yellowing around the edges. I will admit, they have been in cupboard and not washed in 10-15 years 🤭