See Fujishiro, p. 141 for an oshigata matching the mei, yasurime and nakagojiri of this example. The signature on the oshigata dated Kanbun 4 (1664) also matches the present example, giving an approximate date of 1664. On p. 141 is another oshigata, dated Enpo 4 (1676), where the signature is markedly different, especially in the top 'wrapper' stroke and the bottom right stroke in 'Tada,' giving a date of approximately 1670 for this example, which was apparently made when Tadahiro was in his mid-50s.
Tadahiro II (1613-1693) received his working name in 1632 on the death of his father. His two tempering styles were generally either midareba or suguba, as in this example.