Stamped MB-355, which matches the model numbers used by MBC directly. This unit has the optional MB-452 "Add-a-drawer" or perhaps was sold by Vulcan fully populated.
Friction slides. Drawers are removed using a narrow metal strip to disengage a tab.
All drawers are locked when top drawer is stowed. This locking mechanism was patented by MBC: http://www.google.com/patents/US2952497
Bottom drawer pull is missing and has been replaced with dresser knobs.
Drawer pulls can accept a label.