20-ish IIRC. Just checked, and noticed Bison doesn't sell them any longer ...
For what it's worth: I find it pours poorly (...), the rim is a full one and is blocking liquid from going into the spout (spotwelded on the billy) unless you pour very very very slowly - hence liquid goes over the rim and make you spill. I'm contemplating whether or not to remove that bit of rim with a dremmel, to create a smooth flow.
If you can't find a kettle #1, you can also have a look at the MSR kettle (titanium, more expensive though) and adapt it with an added bail arm.