▁obvious ▁distinction ▁between ▁the ▁original s ▁and ▁the ▁ 1 8 7 5 ▁versions ▁is ▁that ▁the ▁latter ▁have ▁no ▁gr ills . ▁Another ▁difference ▁is ▁that ▁yet ▁a ▁third ▁type ▁of ▁the ▁ 1 5 - cent ▁stamp ▁now ▁appeared , ▁similar ▁in ▁fr aming ▁to ▁the ▁first ▁ 1 8 6 9 ▁version , ▁but ▁with ▁some ▁sh ading ▁behind ▁the ▁v ign ette ▁removed . ▁ ▁Tow ard ▁the ▁end ▁of ▁the ▁tw enti eth ▁century , ▁the ▁U . S . ▁Post al ▁Service ▁took ▁a ▁renew ed ▁interest ▁in ▁the ▁p ict orial s . ▁In ▁ 1 9 8 9 , ▁at ▁the ▁World ▁St amp ▁Ex po ▁( h eld ▁in ▁Washington , ▁D . C . ▁in ▁conj unction ▁with ▁the ▁ 2 0 th ▁Congress ▁of ▁the ▁Universal ▁Post al ▁Union ), ▁the ▁Post al ▁Service ▁issued ▁a ▁sou venir ▁sheet ▁containing ▁four ▁images ▁of ▁the ▁ 9 0 - cent ▁Lincoln ▁stamp ▁from ▁ 1 8 6 9 : ▁one ▁in ▁the ▁original ▁red ▁and ▁black ▁colors , ▁the ▁other ▁three ▁in ▁various ▁trial ▁color ▁combinations . ▁Five ▁years ▁later , ▁two ▁new ▁st amps ▁appeared ▁to ▁comm emor ate ▁the ▁ 1 2 5 th ▁anni versary ▁of ▁the ▁p ict orial s . ▁One ▁offered ▁the ▁Battle ▁of ▁Sar at oga ▁design ▁from ▁the ▁ 1 8 6 9 ▁ 3 0 - cent ▁ess ay , ▁re work ed ▁( as ▁a for esa id ) ▁as ▁a ▁one -