Album: Paul Rand and IBM Logo history ...
The story begins in 1956 when designer Paul Rand introduced what IBM refers to as the IBM continuity logo (1956-1972) This logo is the solid block letters IBM in City Medium type font. At the time it was considered a modernization from the IBM in transition (1947-1956) logo in the Beton Bold type font.

Album: The International Brotherhood of Magicians
The International Brotherhood of Magicians (I.B.M.) is the world's largest organization for magicians boasting nearly 15,000 members worldwide. If you have a sincere interest in the art of magic, we invite you to learn more about the I.B.M.!
http://www.magician.org

Album: USTPO registration info ...
In an attempt to better understand the timeline surrounding the Thirteen Striper I went to the United States Patent and Trademark Office's Trademark Electronic Search System (Tess) in search of any and all records that could shed some light on the timeline. What I found fit the evidence nicely.

Album: The ThirteenStriper lived on ...

Album: And then there was the French FifteenStriper ...
In 1965, IBM set up one of its EMEA large systems production facility in Montpellier France. The reasons behind this choice were the presence of an important training network (80,000 students in Languedoc-Roussillon), the qualifications of the regional labour force, and an evolving communication infrastructure. Currently, IBM employs numerous people and has developed a complete network of specialized local sub-contractors. It was in an announcement of this event that I found this, the one and as far as I can tell the only, remaining example of a 15 stripe logo. If anyone ever finds one please let me know !