As of my last update in September 2021, the approximate values for a 1903 silver one cent mercury head are:
1. Average Condition: $1.50 - $3.00
2. Fine Condition: $4.00 - $6.00
3. Very Fine Condition: $7.00 - $10.00
4. Extremely Fine Condition: $12.00 - $18.00
5. Uncirculated Condition: $20.00 - $30.00
Remember, these values can fluctuate based on market conditions and variations in the coin's condition and rarity. It's always a good idea to consult reputable coin price guides or seek an appraisal from a professional numismatist for the most accurate valuation.