A few added comments: Although the small screw in the top lever of a gun with a rib extension is one clue that it MIGHT be a Screw Grip, there's an easy way to tell for sure: Break the gun open (or better yet, detach the barrels) and look at the slot in the standing breech. If you see threads in the slot, then it's a Screw Grip.
I don't believe the Mitsui SKB guns were imported past the late 70's. Didn't last long after Ithaca and SKB went their separate ways. I currently have a pretty unusual Mitsui SKB: 20ga Model 400 Skeet. I think all the Mitsui guns were clearly marked "SKB". Mine has "Made by SKB Arms Company Japan" on the right barrel; "SKB Model 400 20ga 2 3/4" Proof Tested" over "Mitsui & Co. (USA), Inc., Chicago, Ill." on the left barrel.
Last edited by L. Brown; 01/24/14 09:24 AM.
