RICHMOND, Ind. --- Ford Motor Co. is marking the 100th anniversary of the Model T, the first low-priced car that introduced motoring to the masses, at a time when Americans are cringing at the cost of filling their gas tanks and the U.S. auto industry is struggling with plant closings and layoffs.

A weeklong celebration of the Model T promises to offer some nostalgic balm. About 750 of the iconic vehicles were on display Monday in what is being called the largest gathering of Model Ts since they left the factory.

"I'm thrilled to be with the keepers of my great-grandfather's legacy," Edsel Ford II said about company founder Henry Ford to those attending the opening banquet.

The gathering transformed the Wayne County Fairgrounds into a page from the past, with drivers giving a friendly "ah-OO-gah" honk of their horns.

Geff Bland, 42, drove his 1915 Model T to the celebration from his home in Springfield, Mo. It took him three days.

MR. Bland began driving his father's Model T in Mississippi when he was 12 years old.

"We lived in a rural town where I could drive the car and nobody said anything," he recalled. "I used to take it out on the gravel roads. I could hear the engine echo off the pine trees at night, and I liked that."

Richard Wells, 71, of Lucasville, Ohio, was resting in a lawn chair next to his blue 1926 Model T.

"You get out and drive slow," Mr. Wells said. "It's life in the slow lane."

Jay Klehfoth, the CEO of The Model T Ford Club of America based in nearby Centerville, said owners of the Model T are like a big extended family.

"Sometimes we refer to ourselves as the similarly afflicted," Klehfoth said. "We recognize we are only temporary custodians of these rolling pieces of history. We're doing our little piece to try to keep this segment of history alive."

John Heitmann, a history professor at the University of Dayton who has taught classes on automobile history and its impact on American life, said the Model T is one of the most historically significant cars of the 20th century and maybe the single most important American car.

Henry Ford realized there was a big market for cars -- and not just for the wealthy -- and that people would keep buying them, Mr. Heitmann said.

"It was kind of the common car for the common person," he said.

A CENTURY LATER, FORD and other Detroit automakers are struggling to keep up with consumer demands. Buyers are shunning trucks and sport utility vehicles for more fuel-efficient models, and high gas prices and a sluggish economy are keeping sales low.

The Model T gathering in Richmond aims to be more than just an antique car show but a reminder of Ford's groundbreaking automobile.

The first production Model T Ford was assembled in Detroit on Oct. 1, 1908. With the development of the sturdy, low-priced car, Henry Ford made his company the biggest in the industry, according to the Henry Ford Museum.

IN A SPAN OF 19 YEARS, FORD would build 16 million cars with the Model T engine.

The Model T, nicknamed the "Tin Lizzie," was probably the most important vehicle in causing social change in America, Mr. Heitmann said. It helped transform the nation's cities, enabling residents to move farther away from the trolley lines and creating the first ring of suburbs, he said.

"The move out of the city began with the Model T and other vehicles, particularly after World War I," he said.

Mr. Heitmann said the Model T was embraced by farmers and rural Americans.

"It had a very high ground clearance. It was easy to repair. It was so inexpensive that isolation on the American farm came to an end," he said.

After rural Americans used the Model T to come to the cities to shop, crossroads stores in the country went out of business and centralized school systems replaced one-room schoolhouses, he said.

Henry Ford and the Model T also changed the face of the U.S. labor force. Mr. Heitmann said Ford raised wages to attract and keep workers at his factories and employed immigrants and minorities.

"That was really important in kind of creating a class of well-to-do workers," he said.