Some photos for anyone building modern RN vessels. Their stanchions vary from 3 bar asymetrical collapsible ones or 3 bar asymetricl solid tube ones. Sometimes 2 bar collapsible are carried. The older ones had a “ball” on the top of them but the Darings carry a modern version which is flat like photo etch stanchions you can by.
OPVs carry 3 bar symetrical stanchions which appear to be solid. No idea why they are different.
The moral as always is find photos of the vessel you are modelling to ascertain which sort it carried at the specific time you are building.