Scan from Selmer Amplification advertisement - February 1967.

THUNDERBIRD 100, COURTESY OF SEPPO SAMPPALA, FINLAND:

Front Control Panel - Two Inputs; Bright/Normal Switch; Volume; Treble; Bass; Selectortone Pre-Sets; Presence; Reverb Depth; Tremelo Depth; Tremelo Speed; Standby Switch; Mains Switch; Pilot Light.

Four Goodmans 12" Speakers - almost certainly the originals despite the two different types of labels.

THUNDERBIRD 100, COURTESY OF BOB ASTRIDGE, KENT, UK:

We are very grateful to Bob for copies of the photos of his old band from back in 1971. These were the only pictures that we could obtain for quite some time; that is until Seppo sent us the above photos. The T/Bird 100 is obviously a very rare amp!  

(BTW - that isn't Bob in the pictures! The guy seems to be enjoying the 100w of power though!)

Bob recalls - "I can assure you that the Thunderbird was a 100 Watt job. It had 4 x 30 Watt Celestions in it and weighed a ton! Spring reverb lay in base of cabinet with a grey plastic cover over it. Footswitch for tremolo/reverb was held in side of cabinet by a bracket. The footswitch is visible, as are hand holds in the cabinet side, chrome trolley, tone selector switches, and the miserable two inputs only!!"