Hate to resurface an old thread, but....
Those are contemporary mibs, and very nice ones. Size and shape will help, but more the way they are made will tell. The teardrop might be a Wald, Maslach is a good bet. Google or Bing will help when you close in on the maker, the sites above will help. Remember, that most artists stay in the same basic size and shape when they first start. Then branch out, maybe. But they have characteristics that they keep.Salazaar is moon and stars or stars on blue for example.
Get a magnifying glass and check both ends carefully. Most sign with a titanium pen, very tiny. Initials and year made.
Cheri