1. Research before you go. Look for key dates, mint marks, and any unique features that make a coin valuable.
2. Bring a magnifying glass and a small scale to inspect coins closely for any imperfections or signs of authenticity.
3. Don't be afraid to negotiate. Many sellers may not realize the true value of rare coins and could offer them at a low price.
4. Look for old coin albums or collections. These may contain hidden gems that the seller is not aware of.
5. Network with other collectors at the sale. They may have tips on where to find rare coins or be willing to trade or sell.
6. Trust your instincts. If a coin looks too good to be true, it probably is. Be cautious of counterfeit coins and always verify authenticity.