Your first dish is a Channel Master, likely 10', not 8' model.
It comes apart into four wedges and is quite the find.
You can read about 'em here on the forum; ACradio has [ame="http://s970.photobucket.com/albums/ae184/ACRadio/The%20NEW%20ACRadio%20Dish%20Farm/"]The NEW ACRadio Dish Farm pictures by ACRadio - Photobucket[/ame].
I don't know anything about the second dish with the button hook.
Birdview dishes are white, solid (except for the ones which are black 'n perforated), one-piece, 8½' across, from spun aluminum, and have six LNB support struts!
Oh, and 99% of the time, they are on Birdview's unique Horizon-to-Horizon mount at the top of a 6" tube!