Issued in 1911 by the Bishop & Co candy company of Los Angeles, the very scarce E100 issue features 30 players from the Pacific Coast League (highlighted by Buck Weaver).  The cards feature backgrounds of blue, yellow, purple, red or green, and have two subsets - one with a checklist printed on the reverse, and one without.  This "Type 1" example features Walter McCreedie, an extremely scarce card graded PR 1 by PSA due to overall wear and creasing.  A very scarce card, coveted by advanced collectors.