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The square inscription that looks like a seal reads 大明成化 (Dai ming sei ka), or, if you use the Chinese pronunciation Da ming cheng hua, alluding to Chinese emperor Chenghua (mid-1400s) It's apparently a motif that was used by Japanese ceramic artisans to give their wares an air of antiquity and authenticity. I think used by Imari porcelain artisans in the late 1800s.

As Piers suggests……. “Signature” is not a Japanese one. Crudely carved and awkwardly orientated. The underside is not finished to Japanese standards. Can we see the okimono please? I feel this could be Mammoth tusk.