Tip up style 22 rifle, very Teutonic in styling, often referred to as a garden gun. May be marked under the wood, even a proof mark could help determine country of origin.
I am not sure if there is rifling. It is back home so it will be a few days till I can check. After following the lead from Yamaha, I think that it is Belgian in origin. I go home later this week and will check more closely for marks.