rolltop desk information wanted

I have an C-top oak rolltop desk manufactured by F.W. Wentworth & Co, San Francisco. It has lower drawers on both sides of the central area, one central desk drawer and lots of small rear drawers, doored cubbyholes, etc..... It's condition is good but not perfect. The rolltop functions well. I had it re-keyed (3 different keys). 34" deep, 44" tall (top of upper ledge above rolltop), 60" wide. Would like information its age and approx. value. I'm guessing it is from the 1910-1940 period. Could e-mail pics.