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Lead-zinc ore sample in printed envelope. Heath Steel [Canada] zinc concentrate, MV Gerore, 29 Apr 1971, 244.2625 tons, 7.08% moisture. Envelope printed with name “Imperial Smelting Corporation (N.S.C.) Ltd, Swansea Vale Works, Llansamlet, Swansea”. NSC = National Smelting Corporation, which owned ISC. Envelope is sealed with red wax into which are impressed two seals: “Imperial Smelting Corp. (N.S.C.) Ltd, Swansea Vale Works” and the name of an assaying firm: variously “Daniel C.Griffith & Co Ltd, 65, Assayers, London” (four envelopes), “Alfred H.Knight Ltd, Assayers, England” (two envelopes), and “labor. DR.J.Wiess, vorm Rotte-dam, K, Essen” (one envelope); the “65” and “K” probably identify individual members of assayer firms’ staff. The names and numbers appear to have been stamped with rubber stamps made up of loose interchangeable letters and numbers. “Heath Steel” should be “Heath Steele”.