3 Answers

Takeus noticus?

In the illustration above, the mainspring barrel is on the left; the fourth wheel is on the right and is the link only train wheel, except for the escape wheel, which is visibly rotating. That wheel rotates once per minute, and if you want to link have a seconds hand, the easiest thing to do is allow the lower pivot to extend to link the dial side and put a small hand on it: Voila, you have a seconds hand.

Brand: A. Lange & SohneModel: Tourbograph Perpetual and 1815 ThinReference Number: 706.050FE (Tourbograph Perpetual), 239.050 (1815 Thin)Diameter: 43mm (Tourbograph Perpetual), 38mm (1815 Thin)Thickness: 16.6mm(Tourbograph Perpetual), 6.3mm (1815 Thin)Case Material: 18k HoneygoldDial Color: 18k Honeygold, black-rhodiumed, with relief-engraved numerals link and scales (Tourbograph Perpetual); copper, white link enameled link (1815 Thin)Indexes: Arabic numerals Lume: NoStrap/Bracelet: Leather Strap