Watt cautions against tying illustration titles too closely to dates. He first assigned M126 to the period before 1885 and later extended it to about 1911, with the later group livery used under several company names from around then. M15 is confirmed for Mitsubishi Kaiun by Stewart, Merchant Ships and Mitchell. After the 1964 NYK merger, group colours reappeared in the shipping sections of other Mitsubishi companies.
Keep the explicit scope label independent; no alias or company identity is inferred.