That's a fantastic question, and it's one that many sellers of antique and vintage items grapple with. The general consensus among collectors and experienced sellers is that it's best not to polish antique silver before selling it.
Many buyers, especially serious collectors, actually prefer the item with its original tarnish, which is often called "patina." This patina can be a sign of the item's age and authenticity, and it often highlights the intricate details in the silverwork. Polishing can strip away this character, and once it's gone, you can't get it back. Over-polishing or using harsh chemical dips can even damage the piece and significantly decrease its value.
Think of it from the buyer's perspective. Many collectors want the choice to polish the item themselves, using their preferred methods, or to leave it as is to preserve its history. By selling it unpolished, you give them that option. They can see the piece in its untouched state and make their own decision.
If the item is so heavily tarnished that the details are completely obscured, you might consider a very gentle wipe with a soft silver polishing cloth, just to make the pattern more visible for photos. However, the safest bet is almost always to leave it alone. Just be sure to take clear, well-lit photos and mention in your description that the item is unpolished and retains its original patina. This transparency is something buyers will definitely appreciate.
