Lot/6 Set LIGHTHOUSE 1/2 MUGS 6-8 oz American Atelier 5100 SIGNALS Demitasse?

This is a set of 6 American Atelier short porcelain coffee mugs with 3 different lighthouses on each. These are unusual porcelain coffee mugs that are about 1/2 the height of ordinary mugs at 2 3/8 high with the usual 3 1/4 diameter which is typical of ordinary mug diameters. Filled to the brim, it holds 8 ounces though 6 ounces would be safer for use. Demitasse means 1/2 cup but usually the cup is much smaller and holds, at most, 4 ounces. So these are not demitasse in the usual sense. This set has been used but I couldn't find any flaws: chips, cracks or crazing. The colors are bright and they seem to be in original condition.  Please see all of the pictures, feel free to message if you have questions and thank you for looking!