Mike-although not a postcard view, here's an intriguing same-view spot of the Bull Ring from......when? The date says 1970, but I think its a Bull-ring in construction photo from 1964. The Ansells logo on the Rotunda is a deffo for your collection surely?
https//www.ribapix.com/image.php?i=32557&r=2&t=4&x=1
https//www.ribapix.com/image.php?i=32557&r=2&t=4&x=1