Estrada and Stobbs
Stobbs and Estrada were, in fact, only issued on the company sheets. You had to send away for these cards so there are fewer of them available for that reason alone--and the Twins and the Orioles were relatively small market teams (and the Twins had just moved from WDC). Because of that I presume fewer company sets were ordered for these two teams. The rest of the players on the O's and Twins sheets were all available on the back of boxes--so these two players were harder to obtain and in shorter supply than any other Company only cards.
There are two other company cards Bob Turley of the Yankees and Eddie Mathews of the Milwaukee Braves. In my experience it has been easier to find a number of the Yankees Company version cards rather than there Box version counterpart. New Yorkers must have sent away for thousands of the team sheets, and the Braves were incredibly popular in Milwaukee. The team was fresh off a few World Series in the late 1950s and had a number of established stars--Hank, Eddie and Warren to name a few.
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