I've had a couple of the described in 16ga, a few in 12 and one 20.
I still have a 12 that's GECO marked but it has a tiny Sauer marking on it. Does what it's supposed to do. Simple mechanicism, flat springs, tight chokes (common),
cheek piece stock.
The bottom tang has a silver solder repair to the extreme back end of it where the rear tang screw goes through but that doesn't effect it's use. Not noticable unless you remove the trigger guard.
Probably dropped while out of the wood at sometime. Small cracks to the upper stock ears on this one and they are not uncommon on these. Not uncommon on any boxlock really.
Just look them over and judge each gun on it's own.
A 16ga that could be the twin to the one you describe is now owned by a family member. It's fired thousands of rounds and still going just fine.
It too has a hairline crack on the right side upper stock 'ear' but it's been arrested and glued. No further problem.
They do kick due to the light weight. He shoots 9/16 and just barely heavier loads in his. Hunts and skeet shoots with it dispite the Fuller Bros chokes.
I have one other, a 20 ga ejector, that is a Sauer marked gun. Still needs a butt stock finish fitted,,a project in the works.
Some of the guns will have the standard sear pivoting on the lower back edge of the boxlock recv'r. Others will have 'overhanging' sears,,some tout them as superiour in function/ leverage, ect.
Whatever,,they are identified by their pivot screw being way up in the upper rear corner of the side of the frame right behind the fence.
They both work just fine.
Many have cocking inticators on the frame of one type or another. Some not.
Go over it as you would any other SxS and check for the normal wear, use, abuse signs.
Generally excellent guns and give long service.
