strange object that I have found in a field Ww2

[dimmuborgir95]

If I'm not mistaken, this is similar to the "protective bar" for the artillery shell.

[Lewis85]

Thanks a lot dimmuborgir95! it's a real British primer protector for the ammunition of an Ordnance QF 17 lb
However, the discs remain a mystery

[drmessimer]

Could be the cover off a landmine. Dwight

[Danmark]

Could it be the end plate from a 155mm howitzer propellant fiber transport tube?