At the weekend, I had a glass of something I've not tasted in years. It was Theakston's Old Peculier (and yes, it is spelt like that), a darkish brown 5.6% beer that has been around since the 1890s. It is an old ale, a style you don't see very often these days. They can be quite variable in strength, appearance and taste, though they are usually quite strong and dark. You are more likely to come across them in winter.
Back in the 1980s, this was one of the few beers you could get in bottled form. It used to come in a chunky little bottle with a ring-pull top, something I've not seen for anything else. I was trying to find an image of one, but couldn't, so you'll have to take my word for it.