Bvlgari Octo Finissimo Minute Repeater
upload a gifOne of the thinnest, if not the thinnest, repeaters ever made, is from Vacheron Constantin as well: according to the Vacheron Hour Lounge, in 1941-42, some examples of the reference 4261 used 13 ligne repeater movements only 3.1 mm thick.
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pic hostThe Bvlgari Octo Finissimo Minute Repeater: movement, Bvlgari caliber BVL 362, hours, minutes, small seconds, minute repeater. 21,600 vph, 3.12 mm x 28.50 mm, 42-hour power reserve. Titanium case, 40 mm x 6.85 mm, water resistance 30mm.
https://www.hodinkee.com/articles/the-bvlgari-octo-finissimo-minute-repeater-the-worlds-thinnest-in-current-production