Sometimes the original part doesn't exist in the numbers you need, and good reproduction hardware is the honest answer. There's a real difference between reproduction done right, made in the same materials to the same pattern, and a cheap fake that copies the look and nothing else.
When to reach for it
The case for reproduction is usually about matching quantity. A house needs a run of identical hinges, a full set of matching cabinet pulls, a consistent door-hardware suite, and the originals may survive in ones and twos, not in the number the job requires. A faithful reproduction, cast in solid brass or bronze to the correct pattern, lets you complete the set without spending years chasing singles or settling for a mismatch. Materials separate honest reproduction from junk. A good reproduction is solid metal, the same substance the original used, cut or cast to the same design, and it will age the same way. A cheap fake is pot metal or thin plating over zinc, made to look right in the package and wear badly in a year. Honesty is the rule that makes it legitimate: sold plainly as a faithful reproduction in the right materials, it deceives no one and does exactly the work an original would.
Salvager's Note: Buying a reproduction? Confirm it's solid brass or bronze, not pot metal or plated zinc. Solid reproductions age like the originals they copy; pot-metal fakes look right in the box and fail within a year.