Why dimes?
Keep in mind that if we hit a bad situation, those selling what you want to buy may very well only give you face value for the 90% silver coins.
A silver dime is a smaller unit of silver, so it's easier to spend on everyday items.
Keep in mind that if we hit a bad situation,
WHEN we hit a bad situation . . .
those selling what you want to buy may very well only give you face value for the 90% silver coins.
Then you give those sellers paper, not silver.
In which case you tell them "OK, I have some shiny new dimes right here. Face value, right?"
Watch their heads spin.