This domain is found in formate dehydrogenase H for which the structure is known. This first domain (residues 1 to 60) of PDB:1aa6 is an Fe4S4 cluster just below the protein surface [1].

1: Crystal structure of formate dehydrogenase H: catalysis involving Mo, molybdopterin, selenocysteine, and an Fe4S4 cluster. Boyington JC, Gladyshev VN, Khangulov SV, Stadtman TC, Sun PD; Science. 1997;275:1305-1308. PMID:9036855