if you are talking about the patent design of paper notes. sure not changed. in over 100 years
but did you know 100 years ago that $1 bank note could have bought you 17x more things back then compared to now(general inflation)
however peoples labour is about $10 min wage now.
where as in the 1920's it was 16cents meaning to get $1 people had to work 6 hours to get just $1
what you will find is the Naira only devalued due to the whims of the forex markets where america done some nasty things to make the naira value go down in greater consequences to fake stability of the US dollar.
the snowball effect is the naira then had to print more to compensate which then lead to more devaluing to de-compensate.
but thats for another topic in the economics subcategory of the forum