Long time since I've posted. But still enjoy this site.
I recently purchased an M18 shell. Relic condition but solid. Trouble is there are no apparent marks. It is a large size maybe 68/70 also has two holes on right side suggesting Afghanistan army use. I am pretty sure it is not a modern fake judging by the rust pattern and very old repaint over evidence of earlier service.
Some chatter on other forums suggest that some unmarked M18s were made post WW1.
It has a longer brim at the front compared to my ET66 M16. Length overall 34.4cm and width 23.2cm.
Any advice as to possible history would be most welcome.