Like B215a, but new signature (Qasim Ibrahim), new date (2006.07.01/AH1427), Cornerstone watermark, 500 as electrotype watermark, windowed 3mm StarChrome security thread changes red to green.
As of 10 May 2007, all 500-rufiyaa notes issued on or before 1 May 1996 (B209a and B215a) ceased being legal tender. The deadline for exchange was 8 November 2007.
Courtesy of Claudio Marana.