These watches are made in China, only the movement is Swiss quartz.
Philip Stein Prestige collection (that not in this sale) made in Switzerland.
Swiss made watches bear "Swiss Made" sign on a dial and often on the back of a watch. Some super expensive Swiss watches don't have the sign but Philip Stain certainly not this case.
EDIT: I don't even sure these have Swiss quartz movements... People on watch forums opened some PS watches and said there are Japanese and even Chinese made plastic movements inside.