Miller, sorry to be late getting back to your question. Here's a couple quick snaps of my gun with the locks removed. It is a different design than often seen, although I see a lot of these. I think they must have made a lot of them. If you have any of the older Alfa or similar catalogs, look through them and you'll see lots of shotguns using this sidelock design. It is a very slim and light weight quick handling little gun.
Sorry for the poor images, I need to go just now and I didn't even take time to set up a tripod, these are just hand held snaps and not very good, but maybe they'll illustrate the design you asked about.
