4.5-in Howitzer (?) Shell Nose Cone to Identify

[peregrinvs]

My next clean up project. The diameter seems to be 4.5 inches, so I am currently going with that as the calibre. It has an impact fuze so it isn’t from a shrapnel shell and I’m not seeing any obvious signs of blast deformation so I don’t think it is from an HE shell. There are the remnants of a screw thread around the outside of the skirt which is presumably how it attached to the body of the shell.

So I am tentatively identifying it as the nose cone of 4.5-in howitzer chemical shell, but googling hasn’t found a match for a specific type. Can anyone provide a more positive ID?

 

[doctor]

Hi
for me it's for top 60Pdr HE Shell

 

[doctor]

Hi , Sorry it's top 60Pr Gas Shell, Fuze is N°109 modified from N°102.
You can easily see the tipical fuze base on picture 1823 denoting magasin for bursting charge.

 

[Emmy]

It could be a double diaphragm. These were designed to hold chemical seperate to the fuze. These came from the 60lb double diaphragm. Prone to leakage.