Most of you are on target with the circulating of coins and coin being used more back then.
But Scott is right about silver being soft.
Copper nickle is much harder and durable.
The reality is that silver coins wore out faster and circulated more back then. If you find an older copper nickle dime 1965 to date. they show very little wear. same thing with quarters.
Most of us who search halves can attest to this.... When silver was discontinued as the base metal for our coinage people pulled it from circulation quite quickly.
Up until 1965 it was no big deal to see silver coins much less coins that were in circulation for over 50 years.
So most of the silver coins I find that are dated 1962 through 64 are almost mint state. they simply did not see much circulation.
A softer composition coin would certainly wear out being put into service that long. It is part of the reason that they are not, were not .999% pure but rather only 90%.
It's like Gold, it too is soft and that is why jewelry is usually 14 - 18k, because it is more durable as opposed to 24k
In addition. The reason we find any silver at all today stems from a combination of things.
Most of the people who hoarded those silver coins are dying off now and their loved
ones are unaware of the true value of the coins and simply turn them in at the bank.
Hard times are forcing people who hoard coins on a smaller scale, to cash them in
to make ends meet.
There may also be a criminal element at work here because by now most people
know about silver and a thief wont risk trying to capitalize on the numismatic value
by selling them to a coin dealer for fear that the police might have put out a "call if" list.
so they simply run them through a coin counter or returned them rolled to a bank or
simply spend them.
Mojo