Questions about Kuhn Rikon Montreux

For some pans, not all, of this series (Montreux), the specification under "Pan properties" says "aluminium" under coating. Some say "uncoated". Is this a mistake and, if not, what should I think of a stainless steel pan with an aluminium coating? What does this mean?

Hello, does the diameter refer to the bottom of the pan or to the opening? So will this pan fit on an 18cm diameter stovetop? Many thanks in advance

Is the stem hollow inside so that water remains in it after rinsing and then runs out? And are there rivets inside the pot or is the pot completely smooth inside?

Why does this pan only have a 5-year guarantee and if I order the same pan from the manufacturer, it has a 10-year guarantee?

what is the height of the 18cm saucepan?

Good day Is the first illustration correct? As the second shows a different pot. Is a lid included? If not, where can I find it? Many thanks

Ist edr De ckel inklusive?

In the saucepan properties it says: Coating: Aluminium Is this correct? Does this pan has aluminium coating inside the pan, which has contact with food? Or the coating is on the heating base only?

Is it possible to buy the lid separately? In general, I am looking for a 14 cm steel lid.