How to pronounce “1872” in English

One of the earliest studies of the ocean started in 1872, when the British HMS Challenger hit the seas for a 1,250-day journey

We're the first country in the world to create a National Park-- 1872, Yellowstone-- and now it's been emulated throughout the world.

cried again, freezing the year at 1872.

Because there was a horse flu-- this was 1872-- horses couldn't get to the fire.

It doesn't mention it explicitly, but obviously, everyone reading the novel in 1872 would have understood that.