This exact percussion fuze was also used by Romania for our Armstrong 63mm (2.5-in) Model 1883 mountain guns. It was known as "Percussion Fuze model 1881".
It's interesting to note that there are a few differences between the British RL II, the m.1881 as it appears in the manual and ground-dug versions, namely the RL fuze has a big square cutout, the Romanian manual version has a big round cutout, whereas the ground-dug version dispenses with the cutout altogether and has a small plug over the hole through which the firing pin has been inserted into the body of the fuze.