Very nice looking piece.
I can’t tell via the picture, but is there a door to cover writing area when not being used?
Via the 3rd and 4th picture it looks to me to be made of walnut.
Drawers made with the bottom panel extending out past the back panel is fairly common …… but I don’t think I’ve ever seen a drawer that was made with the lower inside of the drawer sides having a 1” +- “extension”.
Looks like maybe, via the picture, the drawer “bottom panel” might be mortised into said “extensions” …….. rather than into the lower edge of the side panels.