Prospective purchasers are advised that several countries prohibit the importation of property containing materials from endangered species, including but not limited to coral, ivory and tortoiseshell. Accordingly, prospective purchasers should familiarize themselves with relevant customs regulations prior to bidding if they intend to import this lot into another country.
The following two lots, 35 and 36, are fine examples of Patek Philippe's reference 3603, in production from 1973 until 1982 and together with references 3587 and 3597 amongst the largest rectangular wristwatches ever made by Patek Philippe.
The Beta-21 calibre was developed by a consortium of watch companies, including Patek Philippe, at the Swiss Electronic Research centre or CEH (Centre Electronique Horloger) in Neuchâtel. It was the first quartz movement for wristwatches with analogue display.
For a ref. 3603 and description and illustration of the Beta-21 see Patek Philippe Wristwatches by Martin Huber & Alan Banbery, second edition, pp. 85, 87 & 332.