* Mint Condition: Unopened bags of coins are assumed to be in excellent condition, but this isn't always the case. Coins could be damaged, tarnished, or have other issues that affect value.
* Bag Type: Was it a bank roll, a roll of pennies, or a bulk bag? Different bag types affect the quantity of coins and thus, the value.
* Mint Mark: While the San Francisco mint mark is valuable, it's not the only factor determining worth.
* Coin Variations: 1964 pennies could be copper or copper-nickel, depending on when they were minted. Copper pennies are more valuable.
* Market Demand: The value of coins fluctuates based on supply and demand.
To get a realistic estimate, you should:
1. Open the bag carefully: Examine the coins for condition and variety.
2. Research online: Look for comparable listings on eBay, CoinWorld, or other coin collecting websites.
3. Consult a coin dealer: A professional dealer can give you a more accurate appraisal, taking into account the specific condition and variations of your pennies.
A good starting point: A bag of 1964 copper pennies in decent condition might be worth around $10-$20, but that's a very rough estimate. Don't expect to find a gold mine, but there's a chance you might have some valuable coins!