UWAJIMA UNYU K.K.

U80’s flag comes from a 1902 chart reproduced in Fune to Hata in 1994, reported by Phil Nelson. Its funnel comes from the 1901 sheet, supplied by Alan Watt.

U26 is documented in the US Navy 1961 and Stewart 1963 references, while U25 comes from Brown 1995; both flags also appear on FOTW. The document supplies no separate written explanation of their differences.