This is actually from the 1976/77 Winter Tour in support of RARO judging by Gene's bass. The LoBue didn't get this particular bridge until after the end of the Summer Tour. Based on the relative lack of binding this is any time December '76-January '77 after which the bass got the studded front cover.

You can see it on his armour as well. It is more of a silver colour on the raro one.