BH,
On many Beretta SxS's the actual model number will be found stamped in the wood on the underside of the forearm.
The CAM 70 is the chamber length which is 2&3/4". However, since the gun is a .410 you would have to say it is chambered for the 2.5" cartridges and not the 3". Three inch chambers would been stamped CAM 76. The KG 1270 is the barrels weight when they were finished or 1.270 KG.
There should be additional markings on the barrel's underside and also on the water table. What are they? Also what is the barrel length?
The gun you depict is made to a very high standard and was likely a comissioned high grade or even a custom shop gun. I've not seen one quite like it before. I'd love to see a few more pics, if its convenient. One of the actions's nose, another of the water table and one of the underside of the action. Is the front trigger articulated? What is the length of pull from the front trigger?
The crown embosssed on the opening lever suggests it's destination was for royalty of some sort. I don't know who the LLL is, but if it is a small to scale gun possibly made for a child, one could say 'Lucky Little Lady or Lad' .. w/their tongue firmly in cheek. Normal Italian might be 'Luso Luso Luso' which would translate to 'very, very, very' special.
Not all you have asked, but perhaps of some minor help for you.
