old topic, but it looks like thee was never too many posts about Mariska Hargitay here.
In season 1 of SVU she wears a non-Breitling silver watch, then in season 2 switches to a two-tone Chronomat. Around season 13 or so she switches to a leather strap Navitimer. This album contains photos from a variety of SVU episodes, most of them pretty small but some big ones.
then at the end of the album is shots of her wearing a different silver watch that I can't identify. I think she only wears this watch in one movie called Plain Truth which you can watch for free here (in low quality):