Hmmm, i would be suspicious of this...
2 years ago i converted my No.42 to No.32 Mk.1 specification for a project. In my quest to gather as much knowledge and reference pictures as possible i came across the identical pictures you posted!
After a little dig around i found the source to be from this very forum! Dated 2010 from another member asking similar questions as you with the same pictures!
https://www.milsurps.com/showthread.php?t=26828
The scope is the real deal as is the mount but this has all the hallmarks of a scam... If it was me, i would be asking for new pictures with todays date on a piece of paper next to it.