Heavy restaurant ware coffee mug by TEPCO in their plain or undecorated Sunglow from the 40's and 50's.   As with most tan bodied restaurant ware Sunglow will mix well with many other patterns.  Backstamp is brown with TEPCO over U.S.A.  over CHINA.  This vintage piece of restaurant ware has no chips or cracks and finish is still bright and shiney.