The present model is distinguished by its stunning shape, which is flared horizontally and in its profile. The case was made by Baumgartner, one of Geneva's greatest case makers who was best known for the Ref. 2526. It is interesting to note that such a complex angular design would come from the workshop of a case maker not necessarily known for rectangular patterns.
An example of Ref. 2456 is illustrated in Huber, M. & Banbery, A., Patek Philippe Wristwatches, Vol. II, Second Edition, p. 137.
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