You can't really do much about those Standing Liberty quarters . I read somewhere about bringing up the date on worn silver kind of like what we use on dateless Buffalo nickels . But I would say your SLQ's are ready for the melting pot .
The only date you could possibly determine is if you have a type 1 reverse, with no stars below the eagle. That would indicate a 1917 (or 1916). Otherwise, no way to tell.
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