In Against Apion Book I, Josephus states:
Nabuchodonosor besieged Tyre for thirteen years in the days of Ithobal, their king; after him reigned Baal, ten years; after him were judges appointed, who judged the people: Ecnibalus, the son of Baslacus, two months; Chelbes, the son of Abdeus, ten months; Abbar, the high priest, three months; Mitgonus and Gerastratus, the sons of Abdelemus, were judges six years; after whom Balatorus reigned one year; after his death they sent and fetched Merbalus from Babylon, who reigned four years; after his death they sent for his brother Hirom, who reigned twenty years. Under his reign Cyrus became king of Persia." So that the whole interval is fifty-four years besides three months; for in the seventh year of the reign of Nebuchadnezzar he began to besiege Tyre, and Cyrus the Persian took the kingdom in the fourteenth year of Hirom.
Here, Josephus incorrectly states that the siege against Tyre began in the seventh year of Nebuchadnezzar. It can be seen how this error is created when it is realised that his placement of the 13-year period puts the end of the siege in 586 BCE, which is the year that siege actually began. Additionally, there is no siege on Tyre mentioned in BM 21946 in Nebuchadnezzar's seventh year (598 BCE), which is instead when it addresses the siege on Jerusalem. But more than that, Josephus' quote from Phonecian sources confirms that the siege against Tyre actually began in 586 BCE, during the reign of Ithobaal, who was not yet reigning in Nebuchadnezzar's seventh year. Ithobal began his first regnal year in 591 BCE, and the "whole interval" from his accession in 592 BCE until Persian control of Tyre in late 539 BCE was indeed "fifty-four years besides three months".