These bags are often made under license, they are normally part of Nikons localised branding, ie only available in Hong Kong etc.
I've seen this bag in China, it is a Billingham, extra marked with Nikon, Canon etc...
But it is a nice bag, I agree.
James,THe bag pictured is NOT a Billingham bag, Billingham bags are handmade just up the road from my house and i can assure you that the one pictured in this thread is NOT one of theres.
If you want a bag that will out live you then get a Billingham and join the 1000's of people who work with them ever day, especially PJ's