Some information from Jeffery on John's fine rifle which engraving shows it was made for a Maharaja.

Jeffery's records show that your rifle was made by Leonard who made most of the rifles for Jeffery. It looks like it weighed 14.5 # which seems very reasonable for 600 NE.
I like the 500 yd sights on a 600 NE. I guess that could be used for long range elephant hunting???
Jeffery sold your rifle for 65 pounds which was fairly expensive.
Unfortunately the Jeffery workbook does not list who bought the rifle. That would have been in the records that were destroyed during WW2.
I believe that if your rifle doesn't show an Indian retailer, that your rifle was bought directly from Jeffery

John replied: hanks very much. I was speaking with an old dealer who is sure my rifle came from a Maharaja’s collection. The engraving on the oval confirmed this.