Vintage Pyrex Glass Erlenmeyer Laboratory Chemistry Flasks, Lot of 3

Item Details: Maker: Pyrex® (Corning Glass Works) Country of Origin: United States (USA) Type: Erlenmeyer laboratory chemistry flasks (Assorted sizing lot) Material: Borosilicate glass Flask 1 (Large - No Graduation): Capacity: 750 mL (Etched text: "750-ML T.M. REG. PYREX U.S. PAT. OFF. MADE IN U.S.A.") Features: Circular frosted marking spot; wide flared rim. Flask 2 (Medium - Graduated): Capacity: 250 mL Features: White enamel printed text and measurement lines (100, 150, 200 mL ±5%); rounded-rectangle white marking spot; model No. 5100. Flask 3 (Small - Flared Lip): Capacity: 125 mL Features: Circular white marking spot; classic round Pyrex insignia logo; includes an inserted white rubber laboratory stopper plug. Condition: Pre-owned vintage labware condition. Glass remains structurally sound with no deep chips, fractures, or cracks visible along the bases or rims. Internal surfaces are clean and free of heavy chemical staining or cloudy mineral etching. Printed and etched manufacturer markings are clear and fully legible.