I think there's an engravers signiture/initials on the edge of the pattern on the right side of the frame.

Looks like 'jb' or JD perhaps.

The pattern that forms a point going forward and to the rear of the frame.
On the point facing rearward, the upper edge,,,it's formed by 4 major scrolls. All the scrolls wind clockwise.
On the outside edge of the 2nd scroll from the point are what I think are the 2 initials.

The pic is tilted sideways of course so take that into consideration when looking at it.