I have displayed them together for years.  They are in very good vintage condition, with no chips.

The four with the atomic/psychedelic berry design are unmarked Holt Howard "blueberry" mugs.  They originally had a Holt Howard sticker on the bottom.  The other two, marked with numbers on the bottom, have coordinating colors and are the same size.  I do not know the maker of those two, but they look good mixed with the HH four.

They measure approx 4 inches tall and approx 1 7/8 inches wide.  The set includes the four matching HH and the extra two mugs, so 6 in total.

Buyer to pay shipping.  I will package carefully in a box and ship promptly.