This Parmigiani Tonda PF Flying Tourbillon reference PFS921-1020001-100182 is the Yoshida edition, issued in a run of 50 pieces. Its automatic movement carries a flying tourbillon, placing one of high horology's purest regulating devices inside the most pared-back branch of the Tonda PF line. That tension between restraint and complication is the point here, and for a collector who values mechanical seriousness without ornamental excess, it is the watch's central appeal. In stainless steel the case measures 42mm across and 8.6mm thick, proportions that keep the watch unusually slim for a tourbillon wristwatch. The green dial gives the edition its defining note and sharply separates it from the more familiar tones of the standard line. Parmigiani has built its recent standing on this kind of controlled design, where the complication does the talking and the case never overstates it. This edition pushes that idea to its cleanest end.