Hi Kevin
I,m not sure what mark they were,they had flash cones on the barrel ends and were mounted in single tubs. I’m building a model of the paddle steamer Thames Queen ,my father served on her during the last WW.
I’m also trying to get measurements for the 2in.No2 Mk1 rocket launcher which was also mounted on this ship,I have various photos of both weapons but lacking precise measurements.
Thanks for the reply.