The flag follows the MOL website. A photograph of Miyashio dated 19 April 2006 shows no funnel of the illustrated form; Rosanoski conjectures that a funnel would have been green with a white G. The tug instead has a flag panel on its white superstructure and a substantial green mast structure bearing a white 27.
Green Kaiji is described as a tug company founded in April 1969 and moved from Tokyo to Nagoya in April 1989; Lloyds instead gives a 1993 formation date.
Keep the explicit scope label independent; no alias or company identity is inferred.