Dipping pens - also, they can be something of a collectable/ antique item, a bit like having, say, a sextant. They might then be on a par with say a box brownie or a gramophone for possible answers to the poll, but not (yet!) on a par with average old record players or cameras. Obviously there are people who collect 1960s/70s/80s tech, and indeed very interesting museums which display them, but I'd consider that to be a different specialisation to more 'classic antiques'.