Does anyone know this pyramid shaped mark on sterling brooch

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I've been searching for the maker of this brooch without luck. It has the initials JP and a mark like a pyramid or triangles within triangles. It is also marked 925.
Thank you.
http://i290.photobucket.com/albums/ll25 ... small1.jpg
http://i290.photobucket.com/albums/ll25 ... small2.jpg

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