As part of my research into WW1 British Rifle Grenades I looked at the marking on the top plates. Some are virtually plain, others are marked in great detail.
Here are some photos - details are in the file title.
No 3 - Mixture of plain and marked.




No 20 - Details - triangles and Vs



No 22
99% of No 22's seem to be un-marked. Not strictly a 'top mark' but interesting.

No 24 Mk I and II



No 35

No 39

It's interesting that the Chief Inspector at Woolwich seemed to demand more detailed markings for the Mills grenade, especially from the No 23 Mk III but the same standard was not applied to rifle grenades.
Hope this is of interest. If you have more - please add!
John
Here are some photos - details are in the file title.
No 3 - Mixture of plain and marked.




No 20 - Details - triangles and Vs



No 22
99% of No 22's seem to be un-marked. Not strictly a 'top mark' but interesting.

No 24 Mk I and II



No 35

No 39

It's interesting that the Chief Inspector at Woolwich seemed to demand more detailed markings for the Mills grenade, especially from the No 23 Mk III but the same standard was not applied to rifle grenades.
Hope this is of interest. If you have more - please add!
John