I'm here... and would have said almost exactly what TP has already said. Mid-19th century Germany or central europe. I confess I've never liked these overly ornate, heavy-featured target rifles so what I know about them is just what I've picked up in passing. The rear sight is a type common on Swiss rifles, but that means almost nothing. It could have been copied almost anywhere.
I should add... its a reasonably high quality combination hunting/target rifle. The adjustable tang sight was for target work and you are lucky to have it. The sight on the barrel was for hunting. One of the mistakes we moderns often make is to confuse quality with decoration. In the mid-19th century the services of very good engravers was relatively cheap. The stepped lockplate and "bun nut" retaining the hammer speaks more to the quality of the rifle than the engraving does... though NONE of these rifles were inexpensive in the sense that "farmer quality" American rifles were at the same time. The fact that it is not signed at all suggests to me it is the product of one of the major arms making centers and that it was intended to be sold elsewhere, perhaps made in Suhl and intended for sale in Bohemia (this is just a guess!) where a local dealer or "maker" would put his name on it. This didn't always happen, so there are unmarked rifles about. Much of Eastern and central Europe had wealthy land-owning gentry but very little industrial capacity in the mid-19th century.
I should add... its a reasonably high quality combination hunting/target rifle. The adjustable tang sight was for target work and you are lucky to have it. The sight on the barrel was for hunting. One of the mistakes we moderns often make is to confuse quality with decoration. In the mid-19th century the services of very good engravers was relatively cheap. The stepped lockplate and "bun nut" retaining the hammer speaks more to the quality of the rifle than the engraving does... though NONE of these rifles were inexpensive in the sense that "farmer quality" American rifles were at the same time. The fact that it is not signed at all suggests to me it is the product of one of the major arms making centers and that it was intended to be sold elsewhere, perhaps made in Suhl and intended for sale in Bohemia (this is just a guess!) where a local dealer or "maker" would put his name on it. This didn't always happen, so there are unmarked rifles about. Much of Eastern and central Europe had wealthy land-owning gentry but very little industrial capacity in the mid-19th century.