I went ahead and bought myself another ebay watch, a nice 1601 two-tone Datejust. Passed ebay authentication, and my own inspection. However, I'm an idiot who read the listing wrong. It's sized for a 7.5" wrist. I feel like sellers take all the spare links and make their watches unwearable.

While I trust ebay items with the authenticity guarantee, most links aren't sold with such a guarantee. Where can I find a trustworthy seller so I can get another 1-1.5" of links?