Legacy brands, what to do?

When it comes to defunct brands can we add something to mark all their items as 'Vintage or Discontinued' across the board, and the brand as no longer operating on its landing page? Or if they've changed their name, there could also be a header for similar or related brands.

On the flip side, take a brand like Supro. Defunct for decades and alive and kicking again under new ownership. Same with magnatone. A trademark is only dead until someone buys it and makes a new product.