Looking at the electric arc pencilled 'STERLING' I'd say with almost complete certainty that this is a fake/repro of sorts. I say this because unless anyone can come up with a better answer, that was not done on the electric arc pencil pantograph machine (where it follows a pattern from the engraving plate) but done by hand - by a blind man in the dark. That would never have got past the Sterling inspectors.
Additionally, isn't the Sterling mark usually set in the fuller on the real McCoy.
I'd say that this identifies the bayonets as '.......of Eastern appearance.......'. There is no sign of any phosphate protective coating either. Sterling were an ISO9002(?) contractor and as a result, their phosphating process and tanks were subject to a daily strength check for want of a better word. None of the old wishy washy stuff there............
Just my twopence worth after having seen a few of Sterlings offerings in my time...........