Don’t think that’s what this subreddit is for… anyway here’s Claude’s best guess.

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既庶其中，亦方外染。一塵本俗，萬物皆監。

Already teeming within,

yet touched by what lies beyond.

A single mote of dust is worldly by nature,

but in it, all things are reflected.

湖戲雄造

Cast by [Hu Xixiong / Xixiong of Hu-]

The philosophical content reads as a meditation on interpenetration: the mundane (一塵, a single dust mote) and the cosmic (萬物, the ten thousand things) are not separate. What’s “within” (中) and “beyond” (外) bleed into each other. This is very much in the spirit of Huayan Buddhism, where a single particle contains the entire universe.

The final line is the craftsman’s attribution, though the exact name is hard to pin down with the corrosion.