Nice looking vintage Fire King Jadeite glass flat bottom coffee mug with D handle. Authentic and stamped as Fire King on its flat bottom base.  There is a small flake at the bottom on the base below the handle and a scratch on the inside.  There is a flea bite on the lip edge across from the handle

Base is stamped as Fire King Oven Glass.

Excellent shine and consistent gloss all around the mug.  Shows and displays great!  A perfect addition to your collection!