I believe this is called a Captains Desk. It has metal rollers on the bottom. It appears to be made from Walnut. On the very top is a letter sorter with a flip top. The slot dividers can be removed, but must be replaced in the same location. The dividers could be made of rosewood or some other very soft wood.
The top has a hinged opening half way from the front and then a pullout desktop. When pulled out there is a green leather work space edged in gold. This work space has a tab on top to pull it up then an easel-type stand in back to keep it slanted. To the right is a pen holder that when pushed comes out to reveal a compartment beneath. Behind the pen holder are two insets, one with an empty ink bottle inside.
To the right side is a door when opens to a set of drawers with knobs. When complete removed the draws are beautifully dovetailed.
The only mechanical issue seems to be the missing hinges on the door. There was no key but the lock on the front can be engaged with a skeleton key I had from another piece of furniture.
The wood itself is worn but still in excellent condition.