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If there is no mint mark, then it was minted in Philadelphia. If the entire coin is worn totally smooth then it's worth scrap silver value. A well circulated one is worth about $5 or so, higher for better condition, uncirculated 1902s are worth from about $90 to $100 for an MS60, to $10,000 depending on condition... from unworn but nicked up slightly (MS60) to the finest known examples (MS67+) commanding $10,000.
Assuming the coin is circulated, the 1902-S Morgan dollar is a better date coin. For an accurate assessment of value the coin needs to be seen and graded. Most coins show a lot of wear. In general retail values for low grade coins are $65.00-$100.00, better grade are $175.00-$267.00 and coins showing almost no wear run from $300.00-$1000.00. In order to be worth $1000.00 they may only show a few scratches. Values are a market average and only for coins in collectible condition, coins that are bent, corroded, scratched or have been cleaned have far less value if any to a collector or dealer