The piece in the red velvet lined box is marked Luer, a French instrument maker. The cutting end has a screw type depth gauge for controlling the cut.
The aspirating apparatus is very unique in that a screw lock extension springs out of the top of the mechanism. It appears to function to break the suction produced by the turn-screw mechanism.
Beautifully turned all metal leech. The plunger is not spring loaded in this unit.
Very simple Luer-type artificial leech. The plunger is held depressed to offset the spring loaded cutting mechanism. The hilt has a series of screw threads, probably designed to hold a cover in place over the cutting mechanism. The cutting end of the leech is shown in the pictures to the right. The end can be reversed to give a cutting edge for flat or curved surfaces.