Ah.....Mouchoir....so many stories....at one time it was a much more powerful scent...
Spray Mouchoir on one hand and Shalimar on the other...wait 10 minutes, now sniff...there's your answer. You'll find they head in very different directions. On me it is quite earthy and rich with amber and cinnamon, animalic with its tonka and patchouli, and slightly buttery floral with iris and jasmine.
To my nose, and for sake of history, Mouchoir is actually closer to Jicky with its lavender and civet notes, less about the vanilla as compared to Shalimar. I find it develops differently when sprayed vs. splashed or dabbed. But you are correct - a high price tag, but a chance to wear a vintage scent that truly has no comparison.
Use the search function to read more comments on Mouchoir from past threads - I think we'd all agree it's longevity is disappointing, but it does work as a second-skin scent. If Guerlain produced additional products it would really help carry this scent further.