I took some quick measurements.
External: 33 3/8" X 9" X 1 3/4" Total height closed is 3 1/2" so both top and bottom are identical.
Internal: 32 1/4" X 8" x 1 1/4" case body is all made from 1/2" wood.
The divider is 32 1/4" x 5 3/4"
I doubt this to be the original case to this gun. It needs to be about 3/8" wider and the small barrel block is cut for a dolls head extension which this gun doesn't have.
I need to make a spacer to hold the barrels in position so they won't hit the stock when the case is tilted.
I hope this helps.