OUR STAFF REPORTER) KARACHII - The State Bank of Pakistan (SBP) has reminded the general public to exchange the old-design and bigger-size banknote of Rs500 from the field offices of SBP Banking Services Corporation and the branches of all commercial banks throughout the country up to 30th September, 2011, the SBP said on Saturday. SBP has also advised all commercial banks to facilitate the general public and create awareness by placing announcements on the counters in accordance with their advertisement policy. It may be recalled that the Federal Govt has already notified that the old-design banknote of Rs 500 (introduced in April 1986) will cease to be the legal tender and not exchangeable with effect from 1st Oct, 2011.