Vintage Japanese Studio Vase, Deep Blue-Teal Flowing Glaze, Signed

This is a Japanese studio ceramic vase glazed in a rich, distinctive blue-teal — deeper and cooler than typical pale jade celadon — with dynamic glaze flow visible both across the exterior and pooling into a near-black depth inside the mouth, signed on the base 幸 / 清窯.

Cultural & historical narrative
What sets this piece apart is the evident control behind what looks, at first glance, like natural glaze accident: the same rich blue glaze that flows and pools so beautifully down the exterior continues onto the interior rim, catching light differently as it deepens toward black at the vessel's throat — a level of attention collectors specifically look for, since achieving a beautiful glaze run on the outside of a pot is one thing, but continuing that same quality of control inside the mouth, where it's rarely seen and harder to achieve, is another. Equally telling is the glaze's crisp, deliberate stopping point at the foot — a clean, confident line rather than a ragged drip — evidence of a wax-resist or wiped-foot technique applied with real skill. Together, these details point to the hand of an experienced individual studio potter rather than mass production.

Attribution note
The base is incised 幸 (an artist's given name or gō, read Sachi/Kō) alongside 清窯 (Sei-gama, "Sei kiln"). I could not locate independent documentation of this specific kiln to add further biographical detail beyond the inscription itself — the reading is clear, but its wider history remains unconfirmed.

Care + closing
Hand wash only with mild soap and a soft cloth. A vase that rewards close looking from every angle — inside and out — for collectors who appreciate technical mastery in studio glazework.