What kind of optic is this?

[NH3CL]

Dear Community,

one of my friend bought this optic a few weeks ago. We didn't know what is is. Can you help me to solve this question?

The markers on it:
KF = Kälte Fett = cold weather lubrication
bmj = Hensoldt & Sohn, Mechanisch-Optische Werke, Wetzlar, Germany.

[Flak bunker]

Have seen one of these before will look it up and let you know

[NH3CL]

Thanks, that will be lot of help for us. We cant find it... :'(

[JERSEY 34]

It looks like the top of a RK31, which has undergone some sort of work to alter it from its original form

[Flak bunker]

that's exactly what it is I think a richkreis 31 being used for something else

[NH3CL]

Thanks, That is is!

[JERSEY 34]

If I am not mistaken, the first photo with the spring in it, if you look to the left there is a 3 letter code .
D.

[JPhilip]

If I am not mistaken, the first photo with the spring in it, if you look to the left there is a 3 letter code .
D.

Hello,
That's correct...
bmj = Hensolit & Söhne, Optische Werke, Wetzlar...
Thanks