Hypodermic Needle in Glass Tube The clear glass tube, featuring an India rubber stopper with a circled 3 stamped on, contains a hypodermic needle. This is made of steel, and it features a push fit into the detachable port, which was meant to be screwed to a device. The needle itself is engraved with the number 12, indicating the size, and “Schaerer” towards the push-fit end. Wear and tear signs visible. 1900-1949