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Shop Vintage IBM Corp "Think" Pocket Notebook Vintage IBM Corp "Think" Pocket Notebook $8.00 3” x 4.5”26 pagesFaux leather cover“THINK” embossed in Black on front cover. Add To Cart Vintage IBM Corp "Think" Pocket Notebook $8.00 3” x 4.5”26 pagesFaux leather cover“THINK” embossed in Black on front cover. Add To Cart