Another excellent source for pre-owned is
Topper Jewelers located in Burlingame, California which is in the heart of Silicon Valley. They rate the condition and give you a very accurate description of any scratches, wear, etc. and a one year warranty on their pre-owned watches.
https://topperjewelers.com/collections/topper-pre-owned-select
They have been in business since 1940 and have an excellent reputation. If you are in the market for a new watch and are in California you should visit them as they have a beautiful retail store with really professional and knowledgeable sales staff. They also do a tremendous amount of online sales and provide overnight, insured shipping. They are an
official Omega Boutique and a
Grand Seiko Salon. They also carry many other fine brands including Breitling, Zenith, Moser, Parmigiani Fleurier, Glashütte Original, Blancpain, Nomos, Longines, Bell & Ross, Zodiac, Oris and have some very expensive G-Shocks that I have never seen before.
https://topperjewelers.com/collections/watches?_gl=1*rvk49u*_up*MQ..*_ga*OTIzMTU3NDkwLjE3NTc1MDYxNTI.*_ga_F79R9KH8TT*czE3NTc1MDYxNTIkbzEkZzEkdDE3NTc1MDcxMzEkajYwJGwwJGgw*_ga_XQ1Y75Q8QW*czE3NTc1MDYxNTIkbzEkZzEkdDE3NTc1MDcxMzEkajYwJGwwJGgw