Excellent condition but ungraded. Mathewson played for NY Nationals. Hall of fame. T-206 Piedmont 150 series.
Thank you for contacting Mearto with your appraisal inquiry.
According to the PSA website, graded examples of this card range in value from $1,100 for a VG-EX4 to $95,000 for a MT-9 example; nearly 200 recorded examples are known to be graded VG-EX4 or lower but less than 60 have a grade of EX5 or higher.
We can't grade from photos and you can determine better than I can from the photos what its condition really is but this may be an instance where it might be worth the time and cost to have it graded if you want to sell it for what it's truly worth.
Based on the photos and information provided, and subject to examination, this is:
An antique Christy Mathewson White Cap 1909-1911 Piedmont Tobacco card
T-206, 150 Series
2-1/2 by 1-1/2 inches
CONDITION: Ungraded. Client reports this card to be in excellent condition
*represents a fair-market value for auction purposes; retail or asking price may vary.
Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.