B-66 longshot

This B-66 did a flypast at Middleton-St.-George’s BoB display, 16 Sept 1961. The tail code appears to be H or M. Can anyone help further???
Another B-66 flew over that day,firmly attached to a KB-50J (which may have been 49-0376), accompanied by an F-100 and an F-101.
Jim