Cant't really tell from the picture, but look closely at the bottom of where the stem joins the pipe - it doesn't quite match 100% smoothly - I actually wonder if it's a fairly cheap 'basket pipe' supplied by the Props Dept?
Given that "product placement" is big you'd think that pipe makers would be clamouring to have their pipes used, but you'd expect them to want their logo shown.
The other extreme is it might just be a Dunhill Shell, but it's that join that bothers me.
I could be well wrong though - I have been plenty of times before!
Gerry