Identify What This Is??

[MARKH]

Can anyone identify this optics?? only marking may be faint ?115,
thanks
Mark

[MARKH]

2

[MARKH]

3

[pzo]

Rundblickfernrohr

This is lower piece of Rundblickfernrohr Rbl. F, probably model 36. It is optical device which allows to fire heavy gun in direction of invisible enemy, in so called indirect fire.