This is #1

[CINDERS]

What is this!

Information

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[Daan Kemp]

Looks like a fin stabilised armoured car round, about 90mm. Could be HEAT, HE, ... Black? To make it look tacticool?

[dman69]

A social distancing round?

[CINDERS]

Sorta Daan on the right track, bit more to see! 303 round bottom Rt for scale.

[Merle]

Sorta Daan on the right track, bit more to see! 303 round bottom Rt for scale.

a recoilless rifle round.

[Tom in N.J.]

It's a huge fin stabilized recoil-less rifle round, black for AP...(?)

[browningautorifle]

106 mm recoiless rifle round.

[CINDERS]

Last 2 correct Jims bang on correctly nailed it a 106mm HEATFS round I should dig out when I took the head apart it has the copper cone in there for the shaped charge I aquired it off a member here for a good price in a bulk lot that was agreeable to us both and I am very happy with the outcome of some of the items after a smidge of TLC and limited resto.
I already had the case just not the hardware that went in it.

[browningautorifle]

Projectiles are scarce. We shot lots of them both heat and practice...didn't know I needed to pick up all the ones that missed during winter as they would be caught by snow and be perfect. Didn't think they'd be valuable these days, 40 years on...

[CINDERS]

Found it this is before I mini resto'ed it but you can see the shaped cone the wire looking piece on the left is that from the fuse to the charge that sits behind the cone!
Its a fairly hefty projectile as the walls are quite thick I suppose to hold together whilst the penetration happens of the armour.