Below on the bottom there is an engraving in large letters (possibly of the owners)
K.M.
A.E.V.
On the bottom of the bottom there is a serial number 115, 118, 120, 126, 129, 137.
Factory name WURTT. METALLW. FABRIK
GFISLINGEN - STEIGE
Below, in the middle, in the recess, there are 2 jewelry hallmarks of the letter NS.