I decided to document the 1983 with a "higher" date
https://en.numista.com/catalogue/pieces740.html
and found this
which is a completely different cup of tea! It's the design, which has changed from 1983 and unwards, since so far I've never seen a 1983 with a long "1"!
Since it's a clean cut from 1983 I don't think we as such need to change the numista catalog, but I'll make a change request to get this into the comments part....
Ole