Hi CowboyBob, thanks for the prompt answer! Seems like you know your way around those things.
I can currently choose between this one (Singer Class 7) and a Singer 132k6. I know that probably neither of those is on the same level as modern machines, neither functionally, nor precision-wise, but they are cheap. I would probably be paying $300 - $400 dollars for each of them and the owners claim them to be in good working condition. And extra bobbins, pedals, thread etc. will follow. This is much cheaper than paying $1000+ for something more contemporary. Regarding parts, I have Germany close by and I have not researched it, but I speculate that if I need parts, this will be the place to go.
I am looking for a machine which I can learn sewing on, I am inexperienced, I have an old Adler 30-1, which I got for a penny and bought it for fun, but it doesn't really do the job with solid vegetable-tanned leather, it's more suitable for thinner skin, like pigskin or similar.
I want to use my new machine for stuff like sewing along the edges of belts (3mm - 5mm thickness), sewing strong tote bags and leather cases (2.5mm + 2.5mm = 5mm thickness or more), but also the occasional wallet or clutch purse with thinner leather, but not paper-thin. In any case we are talking vegetable-tanned leather. I do dye, finish and buff my leather carefully, so rough marks from feeding mechanisms are frowned upon, but they can be tolerated to a certain extend.
If we have to compare the two - (Singer Class 7) and a singer 132k6. Which one is better?