Read this: The largest shareholder on the Arsenal board is American sports tycoon Stan Kroenke. Kroenke first launched a bid for the club in April 2007, and faced competition for shares from Red and White Securities, which acquired its first shares off David Dein in August 2007. Red & White Securities was co-owned by Russian billionaire Alisher Usmanov and Iranian London-based financier Farhad Moshiri, though Usmanov bought Moshiri's stake in 2016. Kroenke came close to the 30% takeover threshold in November 2009, when he increased his holding to 18,594 shares (29.9%). In April 2011, Kroenke achieved a full takeover by purchasing the shareholdings of Nina Bracewell-Smith and Danny Fiszman, taking his shareholding to 62.89%. As of June 2015, Kroenke owns 41,698 shares (67.02%) and Red & White Securities own 18,695 shares (30.04%). Ivan Gazidis has been the club's Chief Executive since 2009.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): In what month and year did David Dein acquire his shares in Arsenal?
unanswerable