It is based on previous similar Ada coin-like pictures from the 2001-2002 Ada-Belgium programming contest.
A previous version of the Silver
"Ada coin" picture was used from 2004 on by ACM SIGAda
The latest update adds "2022" on a Gold
coin, referring to the upcoming ISO standard for the Ada programming language.
The Ada 2012 and 2022 versions were recreated from scratch by Steven Craeynest in a more common format (PNG) and using the highest resolution version available of the original "Lady Ada" image.
© Steven Craeynest
Legal: sort of CC-NC See Dirk Craeynest - Ada Belgium download page
Download the original from Ada-Belgium