This A. Lange and Sohne 1815 Tourbillon reference 730.079 is a limited edition of 100 pieces, pairing one of the brand's hardest complications with the most restrained watch in the line. Its manual-wind caliber L102.1 gives the tourbillon pride of place, and the stop-seconds mechanism remains the detail that sets Lange's handling of the complication apart. For a collector more interested in technical substance than display, that restraint is exactly the point. In platinum, the case measures 39.5mm across and 11.3mm thick, a diameter that keeps the 1815's classical proportions intact. The white enamel dial pushes the watch even further in that direction, reducing the display to its essentials and leaving the aperture for the regulating organ to do the talking. Few modern tourbillons from Lange are this spare. It shows how completely the firm could absorb a high complication into the 1815's Saxon vocabulary without letting the watch turn theatrical.