This is a vintage Pyrex laboratory chemical bottle and stopper. The bottle reads, "Hydrochloric acid, con. HCl" in red lettering on a frosted glass square. The underside of the bottle is marked "Pyrex, Reg US Pat Off, Made in USA"; the stopper is also marked Pyrex.
The bottle has some spots on the edge of the neck (see photo 5). The bottle and stopper each have a small fleabite on the rim, but are otherwise in very good condition.
Size: 7" tall, not including the lid