Each is 7/8" with back paper by San Francisco maker Brunt. Buttons are from the early years following its 1928 opening at the then amazing cost of $1 Million. In the late 1930s the name changed to Winterland serving as an ice skating rink that could be converted to an entertainment venue. Beginning in 1966 with the double bill of Jefferson Airplane and the Paul Butterfield Blues Band, Bill Graham began to use the venue for larger concerts that his nearby Fillmore Auditorium could not handle. One of these buttons is simply blue and white while the other has an irregular brown shape against a cream back ground. The shape most closely resembles an owl on a branch although details are not precise. Both buttons remain in Exc. condition and are the only two examples we've seen.