Is it MG staff? + pictire (+)

[Schneider]

need Your opinion, what is it?

[hochadler]

MG staff, or whatever

Could you post a closeup of the label on the back side?

[Schneider]

!

I could't make any pics, because This thing was offered to me for 100 USD and I would like to know what is it and is it necessary for me or not.....

[Baronvlad]

would it be for working out artillery projectory ? or for mortars