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andy beckerjohn is correct, to a point. baseball Old Mill backs cannot have a frame. Turkey Red (baseball) backs can have a frame or not.....they come both ways.
actress silks (turkey red, old mill, and red sun) can all have the frame....and i believe that they all come only with the frame....i could be wrong there, as i only have a few actress silks (all have the frame), but i do not actively collect actress silks.
no baseball series has ever been documented with the chipboard back.