I decided to bite the bullet and go back through all the pages and of course, I got so sidetracked, I forgot what I was looking for in the first place.
What I did find was a lot of information that I didn't have in the database, particularly from jorgesurcl, so the exercise has been well worth a few hours spent.
I added this one of Jorgesurcl's stamp images to the database as I have been unable to find this stamp and I know there are a million forgeries.

Argentina 1892. Columbus' Discovery of America 4th Centenary SG 219 Scott 90
When I went looking for the Christian name of the designer, I found that this stamp has a quite amazing story.
This stamp was unusual in several ways. It was the first commemorative stamp produced in the Americas and therefore the first Columbian.
It was the first stamp to be released on a card with a special First Day cancellation.
It's conception was the first to be the product of a Citizens' Advisory Committee.
Finally, the 200,000 issued for each value became the first stamps to be for sale and valid for postage for
just one day. No wonder it is hard to find.
The
engraver, Nuesch was a Swiss born
engraver who migrated to Argentina at the end of the nineteenth century while the design was based on a drawing
by Argentine artist, Eduardo de Martino.