Mikasa Color Spectrum DU-900 Alpine White Covered Butter Dish.  Made in Japan.  Microwave and Dishwasher Safe.  Measurements are in the photos.  In Great Pre-Owned Condition, it has a very tiny chip on the underside of the cover that can hardly be seen, I only found because I felt it with my finger.  It can be seen slightly in the last  photo.  When the cover is on the dish, you cannot see it and it doesn't hurt the functionality at all.  Estate Find.