Holster Identification Help Needed
 

Just bought a nice 1916 holster for a 4" Luger. On the inside of the flap in the area of the strap stitching is the following:'

?ESTELMANN
STRASSBURG
1916

I am unable to make out the first letter of the top word (name), and I am guessing at the "EL" between the T and the M.

Other markings on the holster are:
"J. Karlsruhe" and "L.Z.A." both in 2 places.

Would appreciate any information you might have.

Thanks,
Luke