Suggestion from this wrapper sale at LOTG - that the "photo art" may be R313 Fine Pens.
http://loveofthegameauctions.com/lot-7238.aspx
Arguments for:
120 in the series...not 1200, but easily a typo
includes players, as well as "plays" on a number of cards
dimension is almost exactly twice that of the 2nd series batter-ups
Against:
No central fold, therefore unlikely to have been inserted inside the packs (though could have been distributed alongside).