Antique Italian door-knockers can be found in curio shops in Italy, or can be ordered online. Usually the authentic ones have the ring forged to the plate, and the plate is back-mounted, which means that the door would have to be drilled to install it.
Italian Bronze Door Knocker
Ornate Door Knocker In Florence Italy Photograph by Rick
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Sharyn Sowell's Blog: August 2012 Door knobs and knockers, Door
Door knocker, Italian, Venice
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Antique italian door knocker hi-res stock photography and images
Sienna, Tuscany, Italy Closeup of a metal door knocker in
Door knocker by UNKNOWN MASTER, Italian
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Italian Doors
Rare And Very Beautiful Bronze Door Knocker From Italy, 16/17th
Italian Door Knocker Photograph by R Dupras
Italian Door Knocker by R Dupras