[Tools of Ignorance]

I am looking for 1957 Topps baseball checklist 4/5 Bazooka in unmarked condition.

Also, I recently was high bidder for a '57 Topps 4-card panel which includes 3 team cards -- Braves, Pirates, Yankees and individual Stan Lopata. Can anyone shed some light on these 4-card panels? What was their purpose? How rare are they? What might be the price range to expect to pay?

Thanks!