MCM mid century modern porcelain citrus orange stacking coffee cups mugs 1970’s

THIS IS A SET OF PORCELAIN MID CENTURY MODERN 1970’s LOOKING STACKABLE COFFEE CUPS—MARKED CF G-72 ON THE BOTTOMS—THE MUGS FOR THE MOST PART ARE IN GOOD CONDITION, THERE IS A SMALL SCRATCH ON ONE ON THE SIDE OF THE ORANGE WHICH I HAVE PICTURED, THE OTHER HAS A ROUGH EDGE ON THE BOTTOM WHICH I HAVE ALSO PICTURED. EACH MUG IS AROUND 2 3/4 INCHES TALL AND AROUND 3 3/4 INCHES WIDE.