"[Belonging to A]hikam (?)
[so]n of Shaphan"

Possibly the Judean nobleman mentioned in...

Jer. 26:24 But the hand of Ahikam the son of Shaphan was with Jeremiah, so that he was not given into the hands of the people to put him to death.

Compare 2 Kgs 22:12-14: Then the king commanded Hilkiah the priest, Ahikam the son of Shaphan, Achbor the son of Micaiah, Shaphan the scribe, and Asaiah the king's servant saying, "Go, inquire of the LORD for me and the people and all Judah.

Avigad, Nahman. Corpus of West Semitic Stamp Seals. (Jerusalem: Israel Academy of Sciences and Humanities, 1997), 181. Seal # 431.