The phrase "a rare model" is correct and usable in written English.
You can use it to describe an item, typically a collectible or unique object, that is not commonly found or produced.
Example: "The auction featured a rare model of a vintage car that collectors were eager to bid on."
Alternatives: "an uncommon version" or "a unique type".
Masarwa, from Kafr Qara, an Arab town south-east of Haifa, believes the hospital is a rare model of freedom.
For much of the past century, Colombia was a rare model of Latin American economic stability and success.
"They are a rare model called Manwaring chairs because they are in the style of the English cabinetmaker Robert Manwaring," Mr. Howell said.
The price can easily exceed that of a rust-prone original — except when the original is a rare model or one with special factory equipment.
One Friday this September, a striking specimen appeared: a '62 Lancia Flaminia convertible, a rare model produced in collaboration with a Milanese coachbuilder, Carrozzeria Touring.
But in the description of Justice O'Connor's reaction, the story revealed a poignancy and a richness to love in the later years, providing a rare model at a time when people are living longer, and loving longer.
He is an adviser to the Shanghai government, a member of the national legislature and has been named as a "model worker"—a rare accolade for someone in private business.
The different models used to simulate the additive genetic variation were: 1) the QTL model (QM) with 100, 1,000 and 10,000 QTL, 2) a rare variant model (RM) with 100 and 1,000 QTL, the infinitesimal model (IM) and a traditional polygenic model.
Before the night was over, she and Gable went out for a ride in his rare Model JN Convertible Coupe, beginning one of the most famous affairs in Hollywood.
She was a rare role model – female, visionary, with an uncompromised sense of self.
It was a rare performance model, a dwindling breed here, among a herd of hybrids and electric vehicles.
