I'd agree that consumer goods shouldn't be seen as financial investment. However, if anything was to increase in value it's likely to be well the known and high

I'd agree that consumer goods shouldn't be seen as financial investment. However, if anything was to increase in value it's likely to be well the known and high quality "classic" model because it takes a place in history and the company survives, not the cheap knock-off that no one will remember about or cares.