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Brown 1995 gives C606 as an alternative to C605.
The former house flag is triangular and red, bordered white all round, with a white disc near the hoist bearing overlapping red C and T letters. A similar flag already formed part of the logo on the company’s founding instrument, dated 25 November 1916, although its lettering style differed. It was replaced with the 1991 corporate-image change.
The 1930 Larousse letters appear to have serifs.
The 1991 house flag is a white pennant with a blue-white-green T logo, specified in Pantone 280 and 375. It was usually flown from the jackstaff on Algeciras–Ceuta crossings. In November 2005 Santiago Dotor anticipated another flag after Acciona decided to give its subsidiaries a common corporate image; this was a prediction, not a report of adoption.
The source calls this a corporation flag; Rosanoski presumes it was used ashore only.
José Manuel Erbez observed this flag on an office balcony. Eduardo Martín identified it as a corporate flag for buildings, not a house flag flown aboard ship. The accompanying lettered Spanish flag was only tentatively identified as a postal ensign.