Don't have any GBD pipes in the collection. Just got this from England as a vintage GBD. Don't have any knowledge of GBD pipes other than what I can glean from the internet. Not enough info to tell what era this is from. There is one picture on Pipedia of a GBD with the London Made stamping but no indication of age. The pipe is marked on the bpttom: GBD, Special, London Made. There are no other markings on the pipe. The mouthpiece has a silver inlaid GBD. It appears to be vulcanite. The rustification is quite heavy but very regular ?? It looks almost like plastic??Yes, the pipe is very dirty. I know the history of GBD is extensive and dating quite difficult. I don't even know if this might be a fake GBD.?? Any experts want to weigh in? Any comments more than welcome. And any GBD history would be welcomed!! Thanks, Hoppes