The top figure is a figure cast from a mold made by Schneider Bros. of Leipzig, Germany, anywhere from 1890 up to 1945, or by one of the various makers who copied Schneider molds, including Henry Sacks here in the US, in the Twenties, and up to 2 makers in post-war Germany who made reproductions of the molds in a zinc alloy, Höhmann from Cassel, and another whose name escapes me (I bought molds from Herr Höhmann back in the late 90s, they're very good). There were various other copycats, and some Schneider subjects are still available today from [url="http://www.miniaturemolds.com/]Castings, Inc[/url], most notably, the German Imperial bandsmen.
That gives us the origin of the molds. The figure itself could have been cast at any time since Schneider Bros. was in business. It depicts an Egyptian infantryman, charging, circa 1900. I don't have my references handy, so I can't quote the mold/catalog number. The figure was available in two different mold sizes, too. One was the series that produced foot figures around 65mm, which is the one you have, and the other was slightly smaller. It was available in a mold that included a German artillerman, in a pose to sight a field piece.
It's really not worth anything, except to paint it up for your own enjoyment.
I agree with Scott (britfarmer) that the prone machine gunner is either by Barclay or Manoil, but I'd have to check my references (Richard O'Brien's "Collecting Toy Soldiers") when I get home tonight to be sure. This one may have the most monetary value, of the trio, though it may not be too much. This one, too, could be refurbished for fun.
Is the third one hollow? It could be an old battle-scarred Britain or Johilco. It, too, has no value, but it could be rescued today, given the availability of replacement parts.
Prost!
Brad