Simplex 2098-9642 I do have two of these heads, but only one of the bases. Brand SimplexModel 2098-9642Manufacturer HochikiType Smoke Detector
Grinnell IXA-RMS Category : GrinnellThis unit was taken off of a TFX-400 system at Brigham Young University.
Simplex 4904-9101 Category : SimplexThis is the same strobe that is found on the Simplex 4903-9101 strobe plates.
Amseco BZ-51-PC2 Category : AmsecoI like the grille, or in other words, have nothing special to say about this particular unit.