I had a quick look at the Lawrence ones and they look typically ex Indian and certainly from within the serial number range of the huge batch I rebuilt. BUT, they're original and will always be worth more tomorrow.........
The thing about a MK1 is that with a new set of index plates and judicious barring and engraving it can be a Mk2. And if it can be a Mk2, then it can also be a Mk2/1. It get even better because if it can be an L2A1, then a simple change of index ring/range scale it will fit your 7.62mm L42 too!
You won't be able to do this with a fake/repro due to the non interchangeability of parts. All in all, a bog standard Mk1 is a pretty versatile beast