The Breisch-Williams E107 set of 1903 is important because it was the first major baseball card set of the 20th Century. Featuring sharp, black-and-white photographic images, the E107 set contains approximately 147 subjects and has become a popular set among advanced collectors due to the number of Hall of Fame rookie cards (Honus Wagner, Christy Mathewson, etc.), along with the overall scarcity of the set. High-grade E107s are virtually nonexistent, with very few examples graded at the EX/MT level or better by either grading company. The cards are frequently found damaged and torn, with front and back images typically suffering from wrinkling, staining, paper loss, and scrapbook damage. In fact, approximately half the graded population of E107s have been assessed at a level of 2 or lower.

This example of infielder Barry McCormick has been graded Authentic Altered by PSA, and while the assigned grade is technically accurate, the eye appeal is strong for the grade. The image is clear and sharp, the text is all dark and legible, and the borders are beautifully centered. However, there is evidence of pencil writing in the black space above McCormick's head on the card's front, and evidence of an attempt to erase and/or clean the writing, which explains PSA's grade. Only two other McCormicks have ever been graded by PSA, with one of those being a blank back.

The rarity of 1903 E107 Breisch-Williams cards make each example highly desirable; the fact that few are available in higher grades means that any specimen is in high demand.