Pyrex glass coffee pot I have a very old Pyrex glass coffee pot that belonged to my grandmother.   As a kid, I have a distant memory of her using it on a gas stove to boil water.  The pot has a picture of a flame on the bottom of it, but it doesn't say either way whether it's safe to use on a gas stove.   I'm sure the pot is very old;  maybe 1950s or 60s.  Any advice?
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.