This rifle is a very exceptional example and recently sold at Rock Island auction. It is also mentioned a few times (both by serial number and by description) in Rigby's book "Rigby: A Grand Tradition" in the chapter about the Maharana of Udaipur. It is noted as being a .256 and the only original game scene engraved rifle out of his extensive firearm collection even noting an extra charge from Rigby for the additional engraving and best grade finish/wood.

It was not sleeved at the breech end. That is how it was made. It was, however, rebored to 7x65R well before it was featured in this Explora post (you can see where it says possibly "7x65 M/M RIMMED" on the top of the left barrel in the picture in the post) and it appears that the scope mounts may have been added in conjunction with that work whenever it was done.

By the way: I absolutely love the photography in The Explora. These photographs of this rifles are exceptionally better than those done by RIAC for the auction listing.