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Discover LudwigThe phrase "a prototype of his" is correct and usable in written English.
It can be used when referring to a model or example created by someone, typically in a design or development context.
Example: "The engineer presented a prototype of his latest invention at the conference."
Alternatives: "a model created by him" or "an example of his work".
Exact(21)
I drove a prototype of his and was blown away".
Robert Shimaingo, innovator from Kafue, Zambia, with a prototype of his underwater, dam-free turbine.
With a prototype of his dispenser in his luggage, Mr. Alvarado immigrated to Houston in 1984.
One of these was a prototype of his cube, made of 27 wooden blocks; it took Rubik a month to solve the problem of the cube.
The hit had a profound influence on their protégé Phil Spector and was a prototype of his wall-of-sound style, as applied to the Righteous Brothers' hits.
Dr Marka, whose research is funded by the Gates Foundation, says that a prototype of his machine costs a little over $100.
Similar(39)
Near the end of his first quarter, he finished a prototype of Napster, his nickname as a kid because he had nappy hair.
This, he explains, is a working prototype of his system – a model of airspace above the south-east UK.
The image encouraged him to go to his workshop, which was filled with disassembled domestic appliances and, within half an hour, he had a working prototype of his clockwork radio.
Even with that background, and a working prototype of his Game Boy idea, many potential investors were skeptical.
He and his minions get to work designing a working prototype of his concentrator.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com