SIDERMAR DI NAVIGAZIONE SPA.
image by Jarig Bakker, 10 December 2005
The FOTW flag is described as bright blue, with a red square near the upper hoist bearing a white S and, immediately below, a white square bearing a blue m. Rosanoski notes that the rendering is not exactly bright blue and that the shade, like those of S617 and S1186, is guessed.