LFS is a Lorenz Furtwängler and Son registered trademarke.
The logo was first registered as a trade maker in 09/21/1881
and again in 01/22/1895.

The Furtwängler and Son clock factory or Uhrenfabrik (German
for clock factory, direct english translation is hour maker)
was located in Furtwangen, Germany, and founded in 1836.
Sons of Theophil, Hector, Oskar and Aldof all clockmakers
joined the father's enterpise in 1868 and the company changed
to Uhrenfabrik L. Furtwängler & Sohne.  Because they were
makers of clocks which posessed top precision in workmanship,
movements and cases they became world famous.  In 1900
ownership changed hands to A. G. Stock holder Corporation.

Beginning with World War I the clockmaking was by law
drastically curtailed, the company did participate in the
production within the defense industry.  After 1918, the
tough competition of mass produced clocks and less expensive
movements and clocks case forced them out of business and all
operations stopped in 1929.

The logo will give you the date between 1881 and 1925 for
production of that movement, the logo was changed in 1925 to
just read FURTWANGLER.  The size of the escapewheel on the
logo changed in 1885 from smaller then a dime to about the
size of a dime.  This might help with dating it further.

Tim Sweet
TIMEKEEPR2@AOL.COM
M.O.S.T (MY OWN SWEET TIME) WATCH COMPANY.
14002 Tuckey Lane
El Paso, TX  79927  U.S.A.
(915) 852-2409  (See my add in the MART)
Look for my Web site at:
http://www.cyperportal.net/watches/timhome.html

Requests and comments welcome
enjoy