I purchased this Globe-Wernicke bookcase at an estate sale. I want to sell it but have no idea of the age or value. I am attaching pictures of the unit and including pictures of the labels. There are 4 levels. The top level is Standard D-10 1/4, Pattern 110 Grade 217 1/4. ( I can see through the dark mark.) Then the second level is a secretary desk and the bottom 2 levels are Standard D-8 1/2, Pattern 108 Grade 998 1/2.