Pyrex glass coffee pot
Sounds like what you have is Pyrex Flameware, which is range safe.
From the link:

Flameware by Pyrex by Corning Glass Works of Corning, New York is a line of range top kitchenware...
Identification of Flameware is easy as most pieces were imprinted in the bottom of each piece with the &quot;flame&quot; logo, plus the item number and size.