BUZZ-De La Rue: worst day since Brexit vote on Citigroup downgrade
** De La Rue (Other OTC: DELRF - news) , the world's largest commercial banknote printer, down 3.7 pct, biggest pct loss since June 24
** Citigroup (NYSE: C - news) downgrades rating on co to "neutral" v "buy"
** Says Crane's new banknote print facility (industry’s first new print facility for decades) could undermine industry pricing
** Crane (NYSE: CR - news) is number 5 operator by market share, per broker
** De La Rue among worst performers on FTSE All Share Index