Looks like a #5 bayonet but with a 1907 muzzle ring. Here's what the owner states...
"The original blade was shortened from 435mm to 230mm and the tip was ground into a bowie shape, modelled on the BritishNo. 5 bayonets.
Scabbard: This is a standard 1907 scabbard with the leather section reduced.
NOTES:
The bayonets shortened in this way are said to have been used by the South African police.
Total length 352mm
Possibly of South African or Indian origin."
I wonder if it was done up like the #8 bayonet by the Indian arsenals? It ain't a 1907 bayonet of any kind, the blade wasn't shortened...pics...