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.
Door knocker, Italian
Well-Caffeinated Traveller
2,661 Italian Knockers Images, Stock Photos, 3D objects, & Vectors
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