These two cartridges are not shown in Hawkinson’s book.
The short case was one of a pair. I have two headstamps as shown.
Both are made by VSM but with two primer variations.
The long cases are made by Nordenfelt and Vickers with two primer variations.
This long case is called a 14Pr18Cwt long chamber Exhibition gun as used on the Victorian Navy Monitor class warship in 1897 on the web site cerberus.com.au
Short has rim diameter of 111mm. 3 dint crimps 28mm from mouth.
Long has rim Diameter of 103mm. 3 dint crimps 38mm from mouth.
All identification comments are welcome. Ron.