I have two of these cartridges, and an empty “Princess Mary” embossed tin as shown above. One of mine has the RN Sterling Silver bullet jacket containing the identical red pencil shown in the great picture that Dan posted. The bullet in mine has tarnished to the usual black tone that silver takes on. The headstamp on that cartridge is R^L 11 VII.
The other one is missing the pencil in the bullet, which is the same silver-color RN FMJ bullet, without any core at all. It is not Sterling silver, as it does not trarnish, so am assuming it is polished nickel, or if they had them that early, chrome-plated (also, it is not marked “Sterling Silver”). That one has the headstamp KN ^ ^ VII. The broad arrows are at the One o’clock and Four o’clock position on the head.
Both rounds have snapped copper-cup primers.
On the one shown to begin this thread, I would think the case is proper as well as did Pete. It has the usual shallow cannulure right at the top of the shoulder that both of mine do. However, while over the years, I have seen over a dozen of these in various collections and displays, they have all had the same RN, silver-colored bullet in them. I don’t even know what that is in the CAC case shown. I have never seen anything like it before in my life, whether a bullet jacket or any other object.