You can choose any item that is vintage. Tumbled glasses can also fit into aesthetics as a decorative. Greek sculpture busts can give the impression of Dark Academia. You can hang aged papers on your walls. You can decorate your room with candles.
If your budget is a little higher, you can choose vintage world globes, old-style table lamps, and worn chess sets. In addition, gold-framed mirrors and gold frames support the aesthetic.