Vintage backgrounds: Wrigley Fields Schlitz Sign

I got this card in my recent pickup of '69s. I instantly fell in love with this card because of the great background, a unique angle of Wrigley Field. But what was the sign in the background?

I found this uncredited photo of Wrigley Field in 1970 on the NBCSports site. Here you can see an ad for Schlitz beer, one of the major Cubs sponsors at this time. Though it's a different ad, I think the logo here looks the same as the logo on the can above.