Hunter:
I truly doubt your burner is a forgery but the possibilities at this point hereon are endless. It could be a basket pipe, or a second or an order fill from a damned good stateside buyer. (Their cross state competitor in Kansas City was Fred Diebel's and Diebel's was as joined at the hip to GBD as Jost was to Comoy's.)
Then again, it could be a blank. I have a Diebel's stamped Dublin that is one of my best burners. There are no flaws visible to the eye - aside from unattractive graining - and Fred's son, Kurt, ID'ed the pipe as a GBD blank which they sold by the thousands.
If you have access to any Comoy's ephemera I'd try to match the shape of your billiard in a catalog.
It's also very possible that Jost did their best catering to every market level of customer and purchased blanks from the mom and pop shops in St, Claude, or wherever, to meet various price points. More than likely, we'll never know the origin.
Raspberry marked his pipes as were the majority of the Comoy's Jost purchased. Maybe yours fell through the cracks?
The big question is, how does it smoke?
Fnord