I realize this is an old thread but here's 2 cents....
I've got a Mauser-Bauer model 72E skeet gun with 28 inch barrels. This gun was made by Renato Gamba. The one that I have has the blued steel receiver with scrolls. The gun is finely made for a production gun. The only issue that I have experienced with this gun is that I needed to clean the internal trigger group parts of gunk after the first 1000 rounds or so. I think a combination of old organic lubricant and carbon in the air at the skeet range caused the trigger to get gummy and the selector to not properly hand off the trigger-sear. A cleaning and re-lube with synthetic lubricants solved the problem. I would consider periodic cleaning such as this normal maintenance for a finely made gun. I really do not know how other target shooters expect to shoot guns thousands of rounds with no internal cleaning. This gun appears to be based on an Antonio Zoli made guild action.
Next, I have a Werner Special Trap gun made by Konrad Werner. Inside the gun is marked G. Gamba. This is basically a Gamba model 620 with a grayed receiver (as opposed to the case colored or nickeled receiver on Gamba marked guns) and an adjustable comb. This gun has the detachable trigger group. The previous owner also had this gun outfitted with Briley thin-wall choke tubes which I do not believe to be original to manufacture. This gun is proofed 1969 (XXV).
Lastly, I also have a Gamba Edinburgh Trap top single model which is an upgraded steel actioned Franchi Alcione/Falconet single trap model.
What I like most about the Gamba guns is the fine Val Trompa style and craftsmanship. Guido and Renato Gamba have both stated publicly that their attitude is/was to build the finest quality european guns that they could. Renato has expressed clearly over the years that he has no desire to compete with the typical flashy guns built for the American market. His attitude seems to be- if Americans do not appreciate the guns that he makes, then they can buy something else.
Sorry to jump in at this late date but, the Mauser-Bauer Model 72E was built by F.lli Gamba/G. Gamba, not Renato Gamba. The Gamba Model Edinburgh O/U's and top singles
were built by a cousin, Renato Gamba. Part of the confusion regarding the different Gamba companies may be due to the fact that Mauser-Bauer in Michigan also imported pistols manufactured by Renato Gamba under license from Mauser in Germany.
FWIW, Konrad Wirnhier won a gold medal in Skeet at the 1972 Olympics in Munich. Although he did not build the guns bearing his name, he collaborated with the folks at F.lli Gamba in the design and execution of the Model 72, aka Model Montreal, which differs noticeably from the earlier F.lli Gamba/G. Gamba Model Astor 620 which employed a modified Kersten top crossbolting arrangement vs. the 72's sliding underbolt. Both models shared a detachable trigger mechanism. The Model 72 was marketed by Rottweil who may also have used Konrad Wirnhier's endorsement. I especially liked the later Model Montreal 81 in 86 cm unsingle configuration with the ability to adjust P.O.I. Unfortunately, these guns were poorly promoted and did not receive the recognition they deserved.
When F.lli Gamba ceased operation in 1988-89, they sold the design and tooling of their newly developed Boss actioned Model SL-88 to their cousin, Renato Gamba, who currently produces it as the Model Daytona. No other F.lli Gamba designs were acquired by Renato Gamba.
During my last visit to Gardone, I met with Guido Gamba who showed me a number of NOS F.lli Gamba models ranging from the Model 496EA to three Model SL-88's built as prototypes for Remington with one bearing the Remington name in gold letters on the bottom of the frame. It is my understanding that the latter guns have since been sold but, some other SL-88's remain. The Gamba family currently operates a machine tool dealership on the site of the former F.lli Gamba factory.
IMO, the products of both firms represent good value for money.
Montani Semper Liberi