Mac SE/30 Odyssey
My family’s first Mac was an SE. The store mistakenly gave us an SE/30 and we had that for a few weeks until the store figured it out and made us swap it for a normal SE. :-(That was System 6, with HyperCard 1.1 or 1.2. I think the reason OOP has always made sense to me was because I unwittingly learned it from HyperCard. System 6 also came with several animated tutorials, explaining the desktop metaphor, wysiwyg editing, and so on. I’ve never really seen free training materials like that since.