I always thought Google shows page title (whatever is in the <title> tag of the page) as 1st line of each result.
But looking at the search "orologi da collezione" below, it seems Google is showing as 1st line of content the <H1> tag.

Am I right? Is Google showing the content of the H1 tag as 1st line of the serach result or something else got from meta description?
Even more and more interesting when searching for "vendita orologi" the same site comes out, but this time it shows the real page title as 1st line:

