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From ChatGPT
Based on your photographs, I wouldn’t put yours in the $50–$100 generic sewing-box category. Its folding architecture, built-in pincushion, decorative metalwork, contrasting inlay and personalized monogram make it substantially more interesting visually.
Without a maker’s mark or original sewing implements, however, I also wouldn’t justify a $1,000 valuation yet.
My preliminary retail estimate would be about $250–$450. If we can identify its country/workshop, establish that the pale material is mother-of-pearl or another valuable material, or find an example with the same unusual folding mechanism, I could see that estimate moving upward.
For , I would probably start around $425–$495 with Best Offer, rather than saleing it cheaply. That gives the specialist collector time to find it.