Rare mug! The Northrop Grumman Field Engineering Coffee Mug is a round, gray coffee cup made of glass, ceramic, and porcelain. Lettering and design is in black.   With a 12 oz capacity and standing at 4.3 inches tall with a 3.25-inch diameter, this original coffee mug is perfect for any coffee lover. Made in China, this collectible item is ideal for those who appreciate quality and unique pieces in their kitchen or home decor.