[steve-b]

I seem to recall reading that the three bombs detonated by the US were the entire supply, and it took a few months to build any additional ones. In a sense, dropping the last nuke only a couple days after the previous one was a bluff.

[Eric in the Ozarks]

The third bomb after Nagasaki was produced but made it as far as the West Coast when Japan surrendered. (or so I'm told)