Ignatz, your rifle is a Dutch Beaumont-Vitali rifle, made for the Netherlands in the 1880s. These were designed by a Dutchman, Beaumont, who added a box magazine designed by the Italian Vitali, to produce this combination. The rifle's mainspring is located inside the large bolt handle, and they're known to be prone to breakage. The round it fired was known as the 11mm Dutch Remington, or 11.3x45mm. They were replaced by Mannlicher rifles before the turn of the century, and you sometimes see them converted to single-shot shotguns, but still with the 4-round magazine in place.