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Ah, but you have uncorrected the correction by underlining the 1628-9 anchor mark. Confusingly there are 2 anchor marks in the reign, 1628-9 and 1638-9. You have to go by the style of shield used on the reverse and the bust compared to the larger portraits. The earlier anchor flukes tended to be more rounded at the bottom and less pointed at the joint with the upright, plus the earlier coins still used the bust with the ruff, replaced by lace collar or armour later. Briot was at the mint in 1638-9, hence the use of the second anchor on both his and the tower coins.