You might have seen an identical pair of these on the BBC "Antiques Roadshow" a few seasons ago. The expert was viewing a woman's lifelong collection of scissors and scissor-like implements, and these he would not let out his hands! (I wonder if she got them back?) They really are fascinating:
you open the chamber to receive the burnt wick, and when you close it, a guillotine rises up and chops off the used part, thus containing it and the acrid smoke. All in close-plated steel, the sleek design incorporates a point for picking out the bits from the melted wax and three charming bun feet. English, circa 1800. Condition is superb, with little wear to the plating and no rust. Approximately seven inches long by 2-1/4 inches wide by 1-5/8 inches high. BE THE FIRST KID ON YOUR BLOCK TO HAVE ONE!