Since nobody's handled one, I decided to take the plunge and buy one myself. These come in 2 calibers: .22LR and .22WM and four finishes: antique, black, gold and nickel. I found a nickel one in .22LR very reasonable priced on Gunbroker from a local dealer. Of note: retail price on these is all over the place from $100 up to $200. Do some shopping before you put your money down.
The finish does display some machining marks, but nothing major. The nickel job is surprisingly good with a nice, even brightness. The gun comes boxed with a key that can be used to completely disable the hammer. It also has a crossbolt safety that acts as a hammer block. The hammer has a half cock "loading" position and a full cock. The trigger on mine could not be activated while at half-cock. A 90 degree lever turn breaks the action open. When broken open the barrel assemply lifts upward and the chambers have a manual ejector. The barrels both display somewhat rough rifling grooves. The grips are solid walnut with a nice grain. Trigger pull measured consistantly at 5.75 lbs on my RCBS scale with a very positive crisp break. Of note: This firearm is US made, from Dayton, Ohio.
For the money paid, this is a great CAS side match gun or a great addition to your CAS costume. I believe the quality of this piece from Chiappa, is excellent for the price. No it is not a museum quality replica nor is it an exact replica of any 1900 design. For $100+, it looks good and appears solidly built.
I for one don't enjoy the punishing blast of a large bore centerfire derringer. I am not one to carry a derringer as a self defence arm either (I reserve that duty to Mr. Browning's 1911 design.) This pleasant little package in .22LR is going to serve me well as a side match gun and is a fun little conversation piece as well.
(Note: The San Pedro holster in the picture does not come with the firearm.)