Duncan Hill Vintage?

[marktmnt]

I recently went online shopping for a vintage strait pipe. I came across a Duncan Hill Aerosphere with a carburetor in the stem. I fell in love with the look and uniqueness of the pipe and bought it for a mere $21. It does as promised and smokes dry and cool. I find that the draw is a bit too easy; I prefer some resistance to the draw, myself, but am loving the pipe.
QUESTION: does anyone know how old this pipe is, or what year or even decade they were first produced? The seller didn't know and my research online turned up nothing.

 

[Chasing Embers]

Did you see this?
https://rebornpipes.com/tag/duncan-hill-aerosphere-history/

 

[seanv]

Nice pipe. I’ve seen them on eBay often and I’ve been tempted. I have a Duncan super grain nose warmer that smokes fantastic

 

[jpmcwjr]

Great link, Duane.
Here's one similar to the OP's:

 

[Chasing Embers]

Really liking that half saddle stem.

 

[marktmnt]

Embers, FANTASTIC article. I was unaware of this Wordpress sight. Thanks for sharing. I got MUCH MORE information than I hoped for. Loved the restoration step-by-step and the 1980's ads he found. THANKS FOR SHARING!!