BLACK DIAMOND LINES INC

The later flag is yellow with a black diamond and no letters. It appears under Black Diamond in Brown 1934 and on the May–June 1939 timetable, which confirms a generously sized diamond. Brown 1934 makes it nearly reach the edges and suggests an orange shade, Stewart a darker yellow, and the USA Houseflags website ordinary yellow. Mitchell also assigns the funnel to Black Diamond Steamship Corporation. The FOTW source was corrected from Stewart 1963 to Stewart 1953.

The source explicitly acknowledges uncertain aliases and succession. The pipeline's single company label covers distinct legal entities and periods. US country agrees; unexcluded B351/B446 attribution needs temporal/legal disambiguation. The confirmed duplicate A429 was not researched.