The Swiss watch manufacture Jaeger-LeCoultre has been at the forefront of miniature-movement design since 1907, when it created what was then the world’s thinnest pocket-watch movement, measuring just 1.38 mm thick. Continuing with this tradition, the company recently introduced new variations to three watches from the Jaeger-LeCoultre Master Ultra Thin collection.

The newest Master Ultra Thin Tourbillon ($71,500) trades the previous watch’s rose-gold case for a white-gold one. The 11.3 mm–thick watch’s nam…