That website comparison is wrong.
I own a Fagor Elite with the identical bottom stamp as the pressure cooker found at the scene.
It has two pressure settings, 8 and 15 psi.
It was made in Spain and is labeled so.
The Duo has a different bottom label that includes the 18/10 stainless.
Agreed. That web-site comparison is wrong. The Elite site itself states that it has two pressure settings.
Got a picture of the stamp on your Elite?
Is the nut/hole configuration on the inside lid correct?