The phrase "a duplicate of an" is correct and usable in written English.
It can be used when referring to a copy or reproduction of something, typically in contexts involving documents, files, or items.
Example: "Please send me a duplicate of an important document for my records."
Alternatives: "a copy of an" or "a reproduction of an".
The badge Mr. Seignious was carrying was a duplicate of an authentic police badge.
The new building is a duplicate of an adjacent building that was converted and renovated two years ago.
An over-budget satellite navigation system that is years from completion, largely a duplicate of an American system already widely used in Europe and unlikely ever to generate much revenue would seem to be in the budget cutters' cross hairs.
Dr. Charles A. Vacanti, director of the laboratories for tissue engineering and regenerative medicine at Brigham and an author of the studies, said the technique could also raise ethical issues because it might provide an easier way than current cloning techniques of creating a duplicate of an animal, or even a person.
An over-budget satellite navigation system that is years from full completion, largely a duplicate of an American system already widely used in Europe and unlikely ever to generate much revenue would seem to be in the budget cutters' cross hairs.
It's a duplicate of an original Roaring '20s dress and will fit bust sizes 34-36.
Every work is a duplicate of a previous piece.
For the first 50 years of the recording era the manufactured cylinder or disc was a duplicate of a live performance.
To make clear the difference between the two options, stem cell researchers developed the labels "reproductive cloning" (for, say, creating a duplicate of a person from his skin cells) and "therapeutic cloning" (for stem cell research to cure deadly diseases), vowing to do only the latter.
The course can't be a duplicate of a course you've already taken.
We set up a duplicate WIFI network as described in the article, this was a duplicate of a trusted exisitng WIFI connection on the phone.
