I have one of those "mystery manufacture" cocking pieces. I scrounged this back in 1992 from a No4 bolt I found in a gun show parts bin.
I suspect it is a LB/Savage/SM piece that was scrubbed and refinished for Indian/Pakistan service. The bolt was a renumbered Maltby piece that had heavy, block serial numbering, indicative of either POF or Ishapore.
Comments/theories welcome
I was just about to suggest Ishapore reworks and scrubbing.....
I looked at a typical Ishapore reworked No4 early last year belonging to a mate, virtually no original markings or subcontractors markings left after one, or perhaps two Ishy rebuilds.