The Locomobile Model 48 was the car of America’s conservative millionaires—solidly and ruggedly designed using the finest materials, including numerous special metals in the T-head six-cylinder engine.

For the more flamboyant of those millionaires, designer J.

Frank deCausse developed the aptly named Sportif, a fleet four-passenger touring car of close-coupled European inspiration.

It soon became the iconic Model 48 body style and today remains the most desirable to collectors.

Many consider it among the most significant Nickel Era American automobiles.

MR. RUGER’S LOCOMOBILE

One of William B.

Ruger Jr.’s goals with his collection was to acquire and compare the great automobiles of an era—hence his ownership over the years of a Springfield Silver Ghost, a 1924 Packard Single Eight (also offered here), and this Locomobile Model 48 Sportif.

He enjoyed learning the cars’ most minute details and savored the experience of driving and, where possible, improving them.

Few owners have...