Hi Fernando!! The owner says he bought it at a gun show in Louisville, Kentucky USA about four months ago. A most unlikely place.
He mentioned that he might be interested in selling it sometime next year. I would surely like to own this gun. But I fear his asking price.
Can't wait to see more photos.
Hi Fernando K !!! Very good observation on your part. The gun has an external main spring.
The bar at the rear of the trigger is an early form of adjustable trigger. Very unique. I've never seen one before on a gun this early. The owner said he would show me how it works when I get to view the gun again next month.
Rick.