These door handles were designed by Otto Wagner for the Austrian Postal Savings Bank, built in 1906. These original sets offered here have been replaced by newer (with cylinder locks for master key) after the 2nd World War. They are nickel-plated solid brass and thick. In the offered size (interior doors), there are several sets (total and 20). I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution