Sir;
The Royal Artillery used two lead coated projectiles in case, shell and solid design
The Armstrong shell that was lead coated bearing the EOC mark at its ogive was indeed an Armstrong and made at his Elswick Ordnance Company.
I have only seden it as an EOC, Whereas the common shell was made at the Woolwich arsenal but had the same outward appearance with the addition of the R.L. (royal Laboratory) stamped into the lead. It was easily recognized from the shrapnel (case shot) by the presence of the large brass fuze adapter.
The shrapnel or case shot as we term it was a combination shrapnel, shell or unfuzed as a solid shot. The explosive loaded shells could be found with a shipping plug with a No. 2 percussion fuze below or a No 22 Time fuze with a No. 2 below.
The shell on eBay has a forward bearing band. The lead coated projectiles engaged the rifling from ogive to base and did not require a forward bearing surface.
Cheers,
John