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The ASW (actual silver weight) is .18084oz pure silver.
25% = a quarter. A quarter of 1600 = 400 and a quarter of 4 = 1 so a quarter of 1600 - 4 = 400 - 1 that is, a quarter of 1596 = 399. The actual number, 1595, is one less so a quarter of that is a quarter less. Thus the exact answer, with only a little effort, is found to be 399-0.25 = 398.75
The Actual Silver Weight (ASW) is .18084oz of pure silver.
Approximately 750.
If the coin is an "S" mintmarked silver proof coin, it's 90% silver.