The 1937 O-Pee-Chee "Baseball Stars" set featured black and white action photos of contemporary players set against a cartoon background. The players in the 40-card set were die cut against the background so that they could be folded back and stood up. The cards issued in Canada are printed in French and English on the back. The die cuts make the cards difficult to obtain in higher grade.This card of Hall of Famer Charlie Gehringer is one of several Hall of Famers featured in this small but difficult to complete issue. Population Data:SGC Population: 10 total graded 1 at this level 7 higherPSA Population: 16 total graded 1 at this level 13 higher