Here is a complete set used by a German sniper during WWI. The scope was made by Oigee in Berlin, model Luxor 3x. The scope, mounts and carrying case bear the G98 serial number 7368 bb. The case also comes with its little cleaning brush and mount adjustement key.
The well-known picture below shows a German sniper aiming through a similar scope from its trench during WWI. Note the carrying case attached to its belt.
C.P. Goerz Berlin 4x is an interesting WWI scope because it was mounted on a mount which could be seen as the ancester of the WWII turret mount. This was, with the similar Goerz 3x mount, the only mounts from 14-18 that could be changed from a G98 to another one without modification (having the right bases on it, of course).