What is the story of the 'letter carrier'?

It's a staged photograph by Kimbei Kusakabe (or Baron Raimund von Stillfried, they sold each other's works a lot and Kusakabe worked for Stillfried at one point) of hikyaku (express couriers) created to sate Western desire for souvenirs of "real" Japan.

They had long since disappeared by the time the photographs were taken, replaced with uniformed men on bicycles. In the past though, they ran express mail in relays with a partner who carried a torch.

He carried letters.