Mark used the Super 400 mostly for jazz-blues-lounge style (fade to black, your latest trick live) and rock' n' roll (Elvis - Scooty Moore tribute, run me down, or this mademoiselle with Jools Holland), and rarely for "country" (will you miss me) or other style (the lick at the end of each verse on On every street)
this super 400 looks more "jazz-rockabilly-50ies" than "country" to me
When Mark goes "country music", he rather uses telecasters (setting me up, belle star, yakety axe) or grestch (red stagerwing) or even LP (are we in trouble now) and of course acoustic guitars