Brandt Fold Down Writing Desk

We acquired an OLD Brandt secretary or escritoire writing desk.  We would like to know the age & value for possible sell.

In fair to good condition cosmetically with some of the veneer peeling or missing, pitted & scratched up.  Otherwise, GREAT condition structurally.  

Top part has sliding pocket doors.  Behind the pocket doors are slots and 2 small drawers.   Writing desk is hinged and folds down.  There are wooden supports that are hidden/pocketed on each side of the top drawer that pull out to support the fold down writing desk.   Then there are two drawers under the writing desk.   The legs are sleek and tapered to the bottom, where there is a small caster at the end of each leg.   One pull is missing from the bottom drawer and one of the hidden slide supports. 

Fair