7 – 1 9 7 3 ) ▁In ▁ 1 9 6 7 , ▁Ser gio ▁Os me ña ▁replaced ▁the ▁portrait ▁of ▁L una . ▁The ▁note ▁is ▁now ▁pre domin antly ▁red ▁in ▁color . ▁On ▁the ▁reverse , ▁it ▁now ▁features ▁the ▁Old ▁Legisl ative ▁Building . ▁The ▁design ▁of ▁the ▁ob verse ▁was ▁later ▁re vised , ▁switching ▁the ▁positions ▁of ▁the ▁" 5 0 " ▁on ▁the ▁lower ▁right ▁corner ▁with ▁the ▁Central ▁Bank ▁logo ▁on ▁the ▁upper ▁right , ▁the ▁signature ▁of ▁the ▁Central ▁Bank ▁Governor ▁was ▁placed ▁beside ▁the ▁signature ▁of ▁the ▁President ▁of ▁the ▁Philippines , ▁the ▁font ▁for ▁Repub lika ▁ng ▁Pil ip inas ▁was ▁also ▁changed ▁and ▁the ▁text ▁Lim amp ung ▁P iso ▁was ▁made ▁into ▁one ▁line . ▁This ▁design ▁was ▁later ▁used ▁when ▁the ▁Bag ong ▁Lip un an ▁series ▁was ▁released ▁in ▁ 1 9 7 3 . ▁ ▁Ang ▁Bag ong ▁Lip un an ▁series ▁( 1 9 7 3 – 1 9 8 5 ) ▁In ▁ 1 9 7 3 , ▁the ▁" Ang ▁Bag ong ▁Lip un an " ▁text ▁was ▁added ▁and ▁was ▁over print ed ▁on ▁the ▁wat erm ark ▁area . ▁ ▁New ▁Design ▁series ▁( 1 9 8 7 – 2 0 1 3 ) ▁In ▁ 1 9 8 7 , ▁the ▁bill ▁was ▁completely ▁red es igned ▁and ▁new ▁elements ▁regarding ▁Os me ña ' s ▁achiev ement ▁as ▁the ▁first ▁Spe aker ▁of ▁the ▁Philipp ine ▁Assembly ,