Hi kma_ana,
I haven't personally purchased anything from Bob Wingate, but I'd thought I'd pop in and and give you a quick Welcome to TRF being your first post
I did a quick search on out buyers sellers who's who and the site you mentioned did pop up a bit and there are a few users here on TRF that have purchased through Bob Wingate's stie.
Here are a few of the threads :
Trusted websites for a used Rolex
Reputable Pre-Owned Dealer
I hope these help.
Dave.