Number 1 Diesel is also known as kerosene (jet fuel) or pearl oil. In the old days MB strongly advised against running this in a diesel designed for No. 2. It works fine in a kerosene lantern.

Number Two Diesel is also heating oil. I ran a lot of this through ponton series diesels and it works fine if it's clean. You can use a marine fuel filter to make it clean enough.

In my experience it's rare to find No. 1 for sale without an inflated price. But who knows, maybe we're all millionaires now.