The 1902 Morgan dollar has .77344oz (about 25 grams) of pure silver. All U.S. silver one dollar coins from 1840 to 1935 have the same amount of silver.
Assuming the coin is circulated and has no mintmark, the 1902 Morgan dollar is a common date of the series. For an accurate assessment of value the coin needs to be seen and graded. Most coins of...