Fn Browning Model 1910 Serial Numbers

In 1889, Fabrique Nationale (or FN) was founded by a group of Belgian investors for the purpose of manufacturing Mauser rifles for Belgian army. This was to be accomplished under the license from Mauser, with technical assistance of Ludwig Loewe of Berlin. A few years later, in late 1890s, John Browning arrived in Europe seeking a manufacturer for his semi-automatic shotgun. He had severed his ties with Winchester, after a disagreement. This led to a long association that worked out extremely well for both parties. Later Browning became associated with Colt and the world market was divided—with Eastern Hemisphere going to FN and Western Hemisphere to Colt. In this section, we list arms that bear the FN banner. FN-manufactured firearms produced under the Browning banner, are listed in Browning section of this book.

Tamara,
Anthony Vanderlinden's new book, FN Browning Pistols: Sidearms that Shaped World History is a fabulous resource for any FN/Browning enthusiast or anybody at all who is interested in old handguns. I hesitated before spending the $70.00 for it, but am truly glad I did. It is a gold mine of detailed information about all the FN pistols - the 1899, 1900, 1903, 1905, 1910, 1922, High Power, Baby, etc., and it also gives the history of the FN firm and its relationship with John Browning.
The book is available here:
http://www.fn-browning.com/new_page_1.htm
Concerning your gun: Looking at the chapter on the Model 1910, and knowing only your gun's serial number (pictures would be great - is that possible?), what I see and read in the book leads me to conclude that your 1910 was probably manufactured in the very early 1920s.
Vanderlinden does not give precise serial number/year ranges for this model, but he does show pictures of the different versions of the 1910's slide address from its introduction all the way to the '70s. Although pictures would be best, if that's not possible the answers to the following questions would let me narrow things down:
Firstly, the serial number definitely places the gun post-World War I. But exactly how many years after WWI is uncertain.
Whatever its year of manufacture, your 1910's slide address surely must read as follows: 'FABRIQUE NATIONALE D'ARMES DE GUERRE HERSTAL BELGIQUE' and underneath, 'BROWNING'S PATENT DEPOSE'. The first important question is:
1) Are the letters of the slide address in Serif or Sans Serif font?
2) Is the 'de' in the address uppercase or lowercase? I.e., does it read '.D'ARMES de GUERRE.' or '.D'ARMES DE GUERRE.'?
A slide address with Sans Serif type and lowercase 'de' is from the earlier '20s, and an address with Serif type and lowercase 'de' is from about 1925-1929,though I can't narrow things down any further from what Vanderlinden has written. Apparently the transitions between slide address characteristics did not take place very sharply or clearly.