The "Wide Flat Panel, No. 354" pattern was designed by the Heisey Glass Company in 1905, but not advertised until 1910. It was manufactured until 1935. This Domino Sugar Server is clearly marked with the Diamond H on the bottom. It is also marked with the patent date of October 8th, 1912. The server is over 6 inches wide and about 3 inches tall and it is in excellent condition.