Request an undistorted base photograph
Ask for a sharp, straight-on image of the entire base and any side inscription, with enough resolution to distinguish brush strokes. A cropped thumbnail is rarely enough for comparison.
Keep transcription and attribution separate
First record the visible characters exactly as observed. Then note possible readings and comparison sources. Do not silently convert a seller’s reading into an independently verified identity.
Compare documented examples
Use museum catalogues, exhibition records, maker-controlled sources or specialist publications where available. Consider whether the form, production context and mark are consistent together.
Preserve uncertainty in your catalogue
Use labels such as “seller-attributed,” “possible reading” or “unread” when appropriate. Retaining the original listing evidence makes later correction possible.