The emblem combines Nissan’s S with Nihon Yusosen’s lifebelt in the national colours. Loughran draws a more straight-angled S; Brown gives the squared version confirmed by Watt. The FOTW rendering was published under Showa Kaium, which Rosanoski corrects to Showa Kaiun.
Mitchell records this funnel without explanation.
Mitchell’s drawing of Nissan Maru shows a blue funnel with a red top and broad white band, bearing what may be a red diamond surmounted by a blue baton. An emblem is also shown without comment.
Showa Kaiun, also called Showa Line, was formed in 1964 by merging Nihon Yusosen and Nissan Kisen. Loughran names Showa Yusosen as a chief constituent, but Watt does not support this and the company continued to be listed independently. Nippo Lisen [Nittetsu Kaiun] joined the group under the Reconstruction Act, apparently retaining independence as a bulk-carrier pool for Shinwa and Nippon Steel. Showa sold its liner operations to Nippon Yusen Kaisha in 1988 and merged into NYK on 1 October 1998, after which the name was phased out.
Operating subsidiaries included Hinode Kisen, acquired in April 1964, Nagoya Kisen, Nissan Senpaku and Showa Line Engineering. Oceanic Cruise was operated until June 1987 and subsequently listed under Showa’s agency. Showa participated in the Japan Six Lines Consortium, formed in 1972, and the Oasis Container Express Lines consortium of November 1979 with Kawasaki Kisen, Nippon Yusen, Mitsui O.S.K. and Yamashita Shin-Nippon Kisen, whose name Rosanoski queries.
Japan, Tokyo.
Keep the explicit scope label independent; no alias or company identity is inferred.