The picture is pretty fuzzy, but if it was taken in the USA, it might be a Remington Model 1894 or 1900 shotgun.
The receiver looks flat on the sides with a right angle to the bottom of the receiver. No other US manufacturer comes to mind with such simple design. The fore end is also the general shape of a Rem SxS.
It could also be a European gun (maybe England - a Birmingham A&D boxlock).
The picture could also be so fuzzy that you can't see any details of the receiver.