What are 1950's silver dollars worth?

Do you mean a silver certificate? They had blue Treasury seals. The only denomination issued in 1953 was $10. Unless it is uncirculated, your note is worth anywhere from face value if well-worn, to perhaps $25 or $30 if almost-new. Uncirculated, and with provenance to verify that condition, it could be worth up to $100 however. There were other denominations issued in 1953 but they have red seals and clearly say "United States Note" rather than "Silver Certificate".