I lost my Mystery Masterpiece, a Mont Blanc and Van Cleef & Arpels collaboration, it has great sentimental value, Wappo gave it to me when the cartridge ran out so he bought another one.
Pic:
Some more info:
The pen has 840 diamonds and more than 20 carats of gemstones set in a Van Cleef & Arpels patented "Mystery Setting" that conceals the stone settings. A groove is made on the culet, the bottom facet of the stone, which is then slid onto the threads of the lattice design so that the stones can be held in place side by side without any visible support. There are three variations, set either with rubies, sapphires or emeralds, and accented by diamonds. The three variations of these marvellous pens are limited to three releases each for a total of nine. The unique work took over a year and a half to create by skilled artisans.
Otherwise I will have to put a claim in on the insurance as its worth a couple of bob.