Yep. Note the position of the hinge trunions. I think Westley Richards first built an O/U in this general fashion. Beretta sells these by the boatload and they are strong and durable. It's nothing less than a brilliant design, and most guns from Italia use a variation on the theme, thus 'the Italian gun'.

There's more to it all than the number and size of locking bolts...

"The price of good shotgunnery is constant practice" - Fred Kimble