Neither of the backing are dark blue. The frack bar has a black back and the other bar has a dark green back. Just for the heck of it I went throught the award rolls for the Waldeck 4th class with swords and looked for Naval officers. I cross referenced that to the 1918 Navy Ranklist. There were only about 5 Navy Officer who were awarded the Waldeck 4th. Of these only 2 are possible candidates. They are: Mu(unlauts over the u)ssel EK2, WVK4X (page 227 of the 1918 NRL) LT. d. R MarInf (2.Matr R) Duisburg (Landwehr District) VII (Army Korp District) Dr. Rube EK2, WVK4X (page 250 of the 1918 NRL) MarOAssArzt d.R.(1.MatrArtR) Lennep (Landwehr District) VII (Army Korp District)