
Here's a selection of cut away British 25pdrs.
From the left......
Mk 10 - Marked up for Y4 which was Thickened mustard, 221B fuze
Mk 3 - Marked up for Y7 which was Lewisite, 221B fuze
Mk 8 - No markings - 221B fuze
Experimental design with central burster for GB, damaged 221B fuze
Mk 8 - Not marked, contained Chlorosulphonic acid (Smoke) - 230P Fuze