▁comm emor ative ▁bill ▁- ▁In ▁ 1 9 7 8 , ▁the ▁Bang ko ▁Sent ral ▁ng ▁Pil ip inas ▁introduced ▁ 5 0 - pes o ▁bank notes ▁with ▁an ▁over print ▁for ▁the ▁birth ▁cent en ary ▁of ▁former ▁President ▁Ser gio ▁Os me ña . ▁The ▁words , ▁" IK A - 1 0 0 ▁T A ONG ▁K A AR AW AN ▁ 1 8 7 8 - 1 9 7 8 " ▁(" 1 0 0 th ▁B irth ▁An ni versary ▁ 1 8 7 8 - 1 9 7 8 ") ▁are ▁placed ▁near ▁the ▁portrait . ▁ 5 0 ▁years ▁of ▁Central ▁Bank ing ▁comm emor ative ▁bill ▁- ▁In ▁ 1 9 9 9 , ▁the ▁Bang ko ▁Sent ral ▁ng ▁Pil ip inas ▁introduced ▁the ▁ 5 0 - pes o ▁bank notes ▁with ▁an ▁over print ▁comm emor ating ▁ 5 0 ▁years ▁of ▁central ▁bank ing . ▁The ▁over print ▁shows ▁the ▁Old ▁B SP ▁Building ▁in ▁In tr am u ros ▁and ▁the ▁New ▁B SP ▁Complex ▁in ▁Mal ate , ▁Man ila . ▁It ▁appears ▁on ▁the ▁wat erm ark ▁area ▁in ▁red . ▁The ▁version ▁without ▁a ▁year ▁mark ▁and ▁with ▁the ▁signature ▁of ▁President ▁F idel ▁Ram os ▁was ▁released ▁in ▁ 1 9 9 7 . ▁'' 6 0 ▁years ▁of ▁Central ▁Bank ing ▁comm emor ative ▁bill ▁- ▁On ▁July ▁ 9 , ▁ 2 0 0 9 , ▁the ▁Bang ko ▁Sent ral