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<p>[QUOTE=&quot;Debora, post: 204634, member: 1476&quot;]If it were mine, I&#039;d start with the premise that the brooch was original to the box.&nbsp; From the ad, we learn that M. Droz was a high-end jeweler (given the address) of imported natural and cultured pearls and that pins were on sale for 100 fr in the 1930s.&nbsp; So I would assume -- prior to testing -- that the pearls were cultured and the metal was precious.&nbsp; (Can&#039;t see &quot;stones&quot; in your photographs well enough to see what they might be, marcasite or other.)&nbsp; There appears to be no other information on M. Droz available on the internet (besides the ad you found and an empty box that was listed for a modest price on eBay France) but we do know that, because the address on your box is different from that in ad, the store was in business for a period of time and moved at least once.&nbsp; Interestingly though, the store logo and ad design is high art deco and the design of your pin is not which could be a clue that it isn&#039;t original to the box.&nbsp; At any rate, doesn&#039;t really matter as doubtful M. Droz attribution wouldn&#039;t add to value.&nbsp; The thing to do is check it carefully for markings, have jeweler check pearl, metal and stones to ascertain if real/not and make educated guess as to age based on design and trombone closure.</p><p><br /></p><p>Debora[/QUOTE]</p><p><br /></p>

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