What a pipe and restoration. I thought that shape number was vaguely familiar. I did a 552 back in 2013, one of my early restorations. I'm no George Dibos! I foolishly sold it, because I thought it was a filter pipe, but it had the tapered tenon/metal straw. Wish I still had that one. Yours is probably the only one I've seen since.
The replacement stem work is superb. But I fail to see what otherwise makes this pipe so cool. The shape? The insides? The wood? The finish? The blast? It can't be the blast can it? I mean, between that and the Tinsky below, I know what I'd choose (and it isn't the Dunhill).
The original was both chewed through and so deeply green that getting it back to black would have shrunk it noticeably.
The pipe's owner is a hardcore Britwood collector, though, not just pipe smoker, so he wanted a new one to be made instead of the old one patched and "downsized". He enjoys his collection looking (as much as possible) as if they were made yesterday.