### Why These Coins are a Good Offer to Buy:

1. **Historical Significance**:
   - The 1987 United States Constitution Prestige Set commemorates the 200th anniversary of the U.S. Constitution. This set is a celebration of a pivotal moment in American history, making it a valuable addition to any collection.

2. **Certified Authenticity**:
   - Each coin in this set is certified by the United States Mint, ensuring authenticity and high quality. Collectors can trust that they are purchasing genuine, meticulously crafted coins.

3. **Rare and Limited Edition**:
   - The set is part of a limited edition run, making it a rare find. Collectors and investors alike know that limited edition items often appreciate in value over time.

4. **High Silver Content**:
   - The centerpiece of this set, the United States Constitution Silver Dollar, contains 0.76 troy ounces of pure silver (90% silver composition). This not only adds intrinsic value but also makes it a precious metal investment.

5. **Exquisite Craftsmanship**:
   - The proof coins are struck with exceptional detail and mirror-like finishes, showcasing the high level of craftsmanship by the U.S. Mint. These coins are designed by renowned artists, adding to their aesthetic and historical value.

6. **Comprehensive Collection**:
   - This set includes six iconic coins: Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, Kennedy Half Dollar, and the United States Constitution Silver Dollar. This variety makes it a comprehensive and desirable collection.

7. **Investment Potential**:
   - Collectible coins, especially those with historical significance and limited mintage, often appreciate in value. This set offers both collectible and investment potential, appealing to a wide range of buyers.

8. **Legal Tender**:
   - All the coins in this set are legal tender in the United States. While their numismatic value far exceeds their face value, this adds an extra layer of authenticity and significance.

9. **Educational Value**:
   - Owning this set provides an educational glimpse into American history and the evolution of its currency. It’s a tangible way to connect with the past and understand the nation's heritage.

10. **Prestigious Collection**:
    - Being part of the Prestige Set series, these coins hold a special place in the numismatic community. Collectors recognize the prestige associated with owning such a set, making it a sought-after item.

Purchasing the 1987 United States Constitution Prestige Set offers not just a collection of coins, but a piece of American history, a sound investment, and a beautifully crafted set that can be treasured for generations.