Antique clear glass ink bottle embossed on the base “DIAMOND INK CO. / 33 / PATD 12-1-03 / MADE IN U.S.A.”

Produced by the Diamond Ink Company of Milwaukee, Wisconsin, this square bottle dates to around 1905–1915. It features beveled edges, a threaded neck for a screw cap, and a smooth base with bold embossing.

This early machine-made example represents Diamond Ink’s transition from hand-blown to automatic bottle production. Displays nicely with clear glass, light natural age haze, and no chips or cracks. A fine addition to any antique ink bottle or early 20th-century glass collection.

Approx. size: 2 inches tall

Condition: Very good — light interior haze, no damage.

Era: c.1905–1915

Maker: Diamond Ink Co., Milwaukee, WI

Item: Diamond Ink Co. Clear Square Ink Bottle

Maker: Diamond Ink Company, Milwaukee, Wisconsin

Era: c.1905–1915

Embossing (Base): “DIAMOND INK CO. / 33 / PATD 12-1-03 / MADE IN U.S.A.”

Shape: Square with beveled edges

Color: Clear (colorless)

Lip: Threaded (machine-made screw cap finish)

Height: Approx. 2 inches

Base: Smooth with embossed markings

Condition: Very good – light haze, no chips or cracks, legible embossing

Notes: Early machine-made variant with 1903 patent date; transitional design from hand-blown to machine era.