Better made shotguns have gold plated triggers. The salts in the sweat from your finger will corrode the trigger finish when just blued. The salts in bird blood on your fingers will eat holes in your gun!
Lusso grade firearms from Italy are like a Grade 3-5 Browning, a Super Lusso grade, is like a Grade 6 Exhibition.
Your stock is a Field grade, and the engraving is done by machine.
Here's an example of a Lusso Grade stock:
This would qualify as Super Lusso engraving: