A U.S. postage stamp dedicated to the memory of slain politician and gay rights activist Harvey Milk was unveiled Thursday at the White House.

The unveiling coincided with what would have been Milk's 84th birthday and Harvey Milk Day in California.

A post office spokesman told the San Francisco Chronicle that the stamps were “selling briskly” in California.

Close to a dozen speakers attended the first-day-of-issue dedication, including Milk's nephew Stuart Milk and House Minority Leader Nancy Pelosi, a Democrat from San Francisco.

The stamp, available for purchase online, is based on a circa 1977 black and white photograph of Milk taken by Daniel Nicoletta.

Milk was the first openly gay elected official of a major U.S. City. He was elected to the San Francisco Board of Supervisors in 1977 on a pledge to back gay and lesbian rights. The following year, Milk was killed by Dan White, a former supervisor.

“Thanks to Harvey, our society is better forever,” Pelosi said at yesterday's dedication. “Together, we'll finish the work Harvey started.”

According to the Gay and Lesbian Victory Fund, a group that supports openly LGBT elected officials, Milk is the first openly LGBT elected official to be featured on a U.S. postage stamp.