Once again, thank you all for your input; you have been very kind. And of course I have more to ask. I have two options:
(1) Authorized Dealer will sell me the watch with a 2 year extended warranty. This is a well-known, established company with a store near my home that I can go to for service. Can I say the name on the forum? It starts with a T. No Patek papers. Their own papers that state it is a "certified pre-owned" PP. They have a 30 day return policy.
(2) Non-authorized dealer (internet) has the same watch with box and certificate of origin. Price is a little better. 3 day return policy. One year warranty but they are located half-way across the country so I'm not sure how likely I'd be to use them for service.
This watch would be a gift for my husband. He's had his eye on it for about 10 years.
Thank you all for your expertise and advice.