jOe, the fact you posted photos of a sleever here tells me you get 'em after the maintenance has been done. Everything I need to know about a sleever can be summed up thusly-leave it for you.
You make it sound as if it is rare to find a 100 year old English gun that needs work. Quite the opposite is true.
Some needed more than others, it would seem, just going by that beautiful "SLEEVED" stamping on the top of the tubes of your Purdey. Not sure why Weiand didn't turn and run from that Hussey (17 large, and still counting, at the end of the article, and that didn't include the price of wood or the price of admission for buying the gun) but, that isn't my type of story.
Not sure why you didn't run from that sleever, either. I mean, before you bought it.
Best,
Ted
Ted you are truly in the dark when it comes to guns....the Purdey 10ga. I owned was properly sleeved and marked as such on the barrel flats...I doubt without removing the barrels you could even tell it was sleeved. I posted a picture of it with Briley 20 ga. tubes in it and you evidently thought you were looking at the sleeve job. I shot it a couple of years and sold it for about a 3 grand profit and the owner is quite happy.