Heywood Wakefield Drop Front Bookcase Desk m3977

 I picked up this amazing Heywood Wakefield mid century piece in Baltimore. It's a drop front bookcase desk model m3977. It measures 48" W X 44"H X13"D. The lower side schelves & the center shelf are adjustable.It's in really nice shape aside from some minor scratches. It appears to be relatively rare as it's hard to find much on the internet about it. I would appreciate any information regarding the value of this piece.