1977 Phillies National League Eastern Division Coffee Mug

The mug is approximately 4 in tall and 3 in wide without the handle included. Has a number 6 and says a thermal serve on the bottom a division of dart industries Incorporated. This is some type of plastic or melamine not a ceramic mug. Overall in very good condition has one little blue spot on the handle as shown but I never tried cleaning it there is some surface scratching but nothing unusual on the outside but the inside appears to be in excellent condition with no stains. From the research I've done it appears to be a 1977 Phillies national League Eastern division mug.