I've had the Jaeger-LeCoultre caliber 101 set up as an ebay alert for over a decade, in hopes of acquiring one to perform an in-depth disassembly and review at some point. Today is the first time a complete movement has popped up, albeit in a fully functional watch. While justifiable for what it is, $10,000 CAD is too steep to rationalize spending simply to take it to pieces. For now, here's a candid picture of what once was—and may very well still be—the smallest mechanical watch movement ever mass produced.