An antique is generally considered to be an item that is over 100 years old. Vintage items are typically 20 to 99 years old and often reflect a specific era or design style.

Authenticating antiques requires examining the item's craftsmanship, materials, patina, and sometimes maker's marks or labels. For accurate identification, it's best to consult a trained appraiser or antique specialist.

In many cases, minimal and careful restoration can maintain or even increase value, especially when preserving original finishes. However, aggressive alterations may reduce authenticity and value. It’s important to consult a restoration expert.

Some vintage items can appreciate in value over time, particularly if they are rare, in excellent condition, or tied to cultural trends. However, values fluctuate, and it’s wise to research before purchasing for investment purposes.

Look for signs of quality craftsmanship, authenticity, and condition. Avoid items with extensive damage unless you're confident in your ability to restore or repurpose them. When in doubt, seek professional guidance.