Edited to remove live auction link.
Most of Clover's Gundam toys are listed in the
Clover Datafile. Being solid metal they're quite hefty for their size (though barely articulated!) For a long while, these were the closest thing to "realistic" Gundam toys available.
In addition to these, there's a handful of even smaller
mini-diecasts in unpainted and monochromatic colors.
Some pics of the 1:225s:
[
tokyo.cool.ne.jp]