Both shotgun tube flats have the same stylized Eagle with a "crown over S" beside that eagle. On both sides, under the top eagle is another eagle and under that eagle is a "crown over U" with two "16"s under that with the seccond "16" circled. On the left barrel beside the second eagle is a "W" but I don't see it on the right barrel. I did get an automatic response from the GDCA that said they were out of town for two weeks.