Not quite relevant to the Q Vince but photos of these are quite hard to source. My friend from darkest Devon went to |India and asked a railway guard if he could photograph his Sterling but he declined and slung it behind his back. At the next opportunity he tried the same ploy by asking NOT about the Sterling, but could his wife stand next to him for a photo. No problem....., but the gun went behind!
These guns have featured in an Indian Army training film (on You Tube) and recent programmes about the (pretty archaic) Indian Railways. I'm bound to ask whether anyone has such a beast. I have never heard of anyone owning one, even a dewat and when I was researching the subject a LARGE quantity dealer who had good contacts with Indian MoD disposals told me that he'd never encountered one for disposal either. That would appear to back up to the letter and honour the licensing agreement with Sterling that outside sales were not permitted but should be referred back to Sterling.
I seem to recall that the royalties free contract was for an initial 60,000 plus a further 15,000 a few years later