This rare find goes back multiple decades. It was a Japanese promotional Kentucky Fried Chicken (KFC) ceramic mug from 1986. The graphics are still very colorful and vibrant since it was not stored in direct sunlight. We don't believe it has been used since the inside is pristine. The outside of the mug does show a few tiny smudge marks that likely were caused by it rattling against another cup. There is a tiny hard bump at the top of the handle which was done during the manufacturing process.
This mug cup has graphics on one side. It measures 9 cm tall (about 3.75") and 8 cm across (about 3.25") so it would hold a standard sized coffee.
Quite a nice rare collectible from the early Japanese fast food industry!