Hi Jbrax,
I apologize for not reading all the posts. I was responding to your original photos and did not see the photos above or your response that you thought the barrel did unscrew. The gun then is almost certainly a breechloader, hence, no ramrod. You simply unscrew the barrel, put powder in the chamber, set a ball on top, and screw the barrel back on. I am curious if there is a short inner barrel extending a few inches beyond the stock. That way the gun could be used as a pistol or carbine without the long barrel. The barrel is screwed on if you want to go fowling but when traveling, you have the short barreled gun for protection. I don't know why they often covered the barrels with wood. Perhaps, it was to give better grip for unscrewing the barrel but it also might just be fashion. Regardless, I suspect your gun is quite rare and probably worth a fair amount. Unfortunately, I don't know what the value is. The design dates back to the beginning of the 17th century at least. In Lavin and Guslers book on decorated firearms, they show a fine wheellock made by Pierre le Bourgeoys using the same idea. It was made during the first quarter of the 17th century.
dave