And from page 20 – Taking care of your watch –
http://www.patek.com/pdf/instruction..._QA_LU_24H.pdf – online PDF version of owners manual.
Quote:
Certificate Of Origin
A Certificate of Origin was issued for your watch. Among other information, it indicates the movement and case numbers. It must be signed and dated by an Authorized Patek Philippe Retailer. It guarantees the authenticity of your watch and validates your warranty privileges.
The unique movement and case numbers of each watch are transcribed into the workshop journals, and each owner of a Patek Philippe watch may use the registration card supplied with the watch to be added to the Patek Philippe “Register of Owners.”
Registered owners are entitled to receive the periodically published International Patek Philippe Magazine free of charge.
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As mentioned in a comment above, the written warranty does not stipulate that it is restricted to the original purchaser solely, and as per the M-M Act, is therefore a Limited Warranty, as opposed to Full Warranty.
Nevertheless, the Act states that:
Quote:
(a) Full and conspicuous disclosure of terms and conditions; additional requirements for contents in order to improve the adequacy of information available to consumers, prevent deception, and improve competition in the marketing of consumer products, any warrantor warranting a consumer product to a consumer by means of a written warranty shall, to the extent required by rules of the Commission, fully and conspicuously disclose in simple and readily understood language the terms and conditions of such warranty. Such rules may require inclusion in the written warranty of any of the following items among others:
(2) The identity of the party or parties to whom the warranty is extended.
(13) The elements of the warranty in words or phrases which would not mislead a reasonable, average consumer as to the nature or scope of the warranty.
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Taken from
https://www.law.cornell.edu/uscode/text/15/2302
It would be my understanding, as a “reasonable, average consumer”, that there is no limitation to which owner the warranty only ever applies.