The ref. 2526 is famous,
link but the ref. 3428 was produced in smaller numbers and is even rarer.
link At first glance, the ref. 3428 and ref. 2526 look the same, so one might think that the only
link difference is the movement. However, due to this difference (cal.12-600AT is 5.4mm thick, while cal.27-460 is 4.6mm thick), the ref. 3428 has a thinner case than its predecessor.