Not relevant to the subject gun, but for future assistance, I found this:

2007 in response to a question regarding use of steel shot
"Our guns in standard aren´t tested for steel. Guns are only tested for steel when is required by customer and in that case is stamped in barrels with a fleur de lis."
Regards. AYA-AGUIRRE Y ARANZABAL, S.A."

https://www.shotgunworld.com/threads/are-new-ayas-steel-shot-rated.144024/
Since 2012, all AyA shotguns have been proofed for High Performance Steel and are stamped with the Fleur-de-lis.
I have an AyA manufactured in 2009. I wrote to AyA and asked if there was a qualitative difference between barrels made in 2009 and barrels made in 2012. Here is the answer I got, verbatim:
"Some technical specifications always changes (sic). Our advise (sic) is to use cartridges under tested proof."

This lists only the No. 56, 37 & Augusta with "Chrome Nickel Steel"
https://doublegunshop.com/aya2.htm
https://doublegunshop.com/aya3.htm

https://sites.google.com/a/damascusknowledge.com/www/home