It's interesting how scarce some coins become when the metal content changes. In the 1980s (and likely well before) you almost never found a pre 1965 quarter or dime because those were primarily silver and worth significantly more than face value. Yet today, even though a 1965 quarter is more than 50 years old they are still very common. If you pay attention, you'll notice that pre 1982 pennies are becoming more scarce. Nowhere near as scarce a silver but still harder to find then they were a few years ago...