The first is the "Bob Lazar" ufo by Testor in 1/48 scale. This is an Area 51 S4 UFO that started all the rage in the early 90's.
is the Saucer from the "Invaders" TV series. The kit was released by
Aurora, Monogram, Polar lights and now by someone else. There is lots of
aftermarket for this kit. Both models were finished in Alclad.