What does HSR stand for?

Historic Sportscar Racing

This definition appears very rarely and is found in the following Acronym Finder categories:

Organizations, NGOs, schools, universities, etc.

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Samples in periodicals archive:

Many motoring clubs will also use the show to promote special activities of their own, such as the Classic Sports Car Club's "trip of a lifetime" to race at Daytona as guests of the Historic Sportscar Racing Club of America.

Return of London to Sydney Marathon; motorsport

This includes Historic Sportscar Racing, Porsche Club of America, Porsche-BMW Owners Club, SCCA, Grand American Road Racing Association (24 Hours of Daytona), and the American Lemans Series.

TodayMD Renews Race Sponsorship With Alegra Motorsports for a Third ...

Classic Motorsports has announced that the legendary racer will serve as the honorary Grand Marshall at the Historic Sportscar Racing Mitty Challenge set to begin on May 2nd.

Bondurant to Grand Marshall the Historic Mitty