Welcome to the online catalogue of the British Optical Association Museum. Here you can search for both museum artifacts and archives. Data is transferred from our Collections Management System to this website on a regular basis.
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Objects
automatic button and chain ACCESSORIES ear chain Ketcham & McDougall North America: USA, New York Post 1910 metal; plastic overall diameter: 25 mm
Round black button with inscribed yellow metal backing, clip and pin fastener. Retractable spring chain and hook.