The saucer on legs is far less common than the version on wheels. I believe it may have been discontinued at some point in time, for it doesn't seem to be included in later sets by LP or the brands LP supplied toys for.
Size
Diameter
Height
40 mm
40 mm
1 9/16 in
1 1/2 in
Colours
Green rim on silver-grey base and legs
red dome, white figure
Probably also exists in other colours similar to version on wheels
Seen one with red rim and clear dome on grey legs
Like the saucers on wheels, the rim of the saucer is marked "Made in Hong Kong".