1969 advertisement for Acoustic amplifiers, featuring the Chambers Brothers. From left to right:George Chambers (Gibson Thunderbird bass), Lester Chambers, Brian Keenan, George Chambers, Willie Chambers
$400
$100
$300
$2500
$299
$995
$200
$99
$350
$295
$220
$190
$3185
$150
$180
$50
$99
$4400
$145
$68