No, it should not be fired in older Belgian Brownings.
No, due to the damage steel does to the barrels. Not recommended by Browning
You will have to contact Browning for a correct answer.
You MUST call Browning to get a correct answer.
Browning Double Auto or Twelvette. Double Atuo's built as skeet/trap specific guns. Twelvettes were first built as a light weight womens gun.
Depends on when it was made.
Yes.
You risk damaging the barrels if you do.
The Browning "Twelvette Double Auto" was made with an aluminum alloy frame that was anodized various colors during the '50s and '60s. I believe that grey was one of the more popular colors.
Identifies the barrel as suitable for modern loads.
You can, but, you will cause a barrel bulge after a while.
Not in Belgium barrels
For the BEST answer, contact Browning Customer Service through their website. SOME older shotguns should not use steel shot, due to wear at the choke. Some will handle it fine. Browning should be able to give you the definitive answer. FWIW, there ARE alternatives to steel shot in a lead-free zone- bismuth for one.