Leopold Rolltop Desk

Another inherited item with sentimental value.  Sitting in the garage isn't doing it any good.  Not sure if I want to sell.  After researching (identified with metal insignia in top drawer to be Leopold Desk), I found the closest match on the University of Iowa website for the Leopold Desk Company.  In the Leopold Desks 1920-1930 Catalog, it appears to be Number 9 Line, Page 37, Illustrating Number 9160.  I would like to pinpoint a more exact "year" if at all possible.  Rolltop in good condition, have all three keys, pidgeonhole compartment complete.  Interested in value and whether I'm better leaving it alone or restoring it? 

Thanks in advance for any assistance! 

Fair