Mary is one of the smallest Dealers and can be thought of more like a custom shopper. If you send her photos and a description of what you want, she will go out into the watch bazaar areas of the City to search for something to fill your order. She can also try and buy spare parts for you, directly from the rep factories.
There is a Watch International web site, but it's basically just a copy and paste of someone else's web site, and simply there to give her some small web presence.