Hello,
from what I can see in the provided pictures, the cross is a pre-1918, private purchase piece. This is quite reassuring, I hope, since many pieces offered on the market are the rather well-made copies made by Messrs. Rothe & Neffe, Vienna, until the mid 70s of 20th Century.
In the hope of being of some help, I would like to post some pictures of an original cross, made of gilt silver, struck with all the correct marks we would like to see on such pieces.
As a curiosity, I would also like to post the images of a further cross for 50 years service for officers, of a quite uncommon to see variation.
These two pieces are from my own collection.
All the best,
Enzo