Wet-blue and other wet-state tanned skins of animals not elsewhere specified — hair removed, split or unsplit, but not further processed beyond tanning — occupy an intermediate position in the leather supply chain, typically traded between tanneries and finishing operations. The single US tariff line 4106910000 captures all such skins not covered by more specific headings, making correct species identification and processing-stage documentation critical at entry. Importers should confirm that the goods have not undergone any post-tanning finishing, as additional preparation would shift classification to Chapter 41's further-prepared leather headings.

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