Indeed, very unique, I wonder how it smokes. When I see a pipe that's unique like that I always try to picture it hanging from my mouth. That one is a little hard to picture.
Can you post some additional pictures and stamping? I've never seen a GBD in that shape. City Deluxe made this shape and called it a "Jollyboy", here's one I restored last year.
This pipe is up for auction on ebay. Just type in GBD Unique an it will come up. AL that pipe looks real familiar I think I'm looking at it on my shelf.