OT: Killebrew
 

Any idea what publication Harmon Killebrew is signing in his 1975 Topps photo. Appears to be a Marlboro ad on the back, and I guess it may or may not have Killebrew on the front.

I always assumed it was a game day program from whatever ballpark the Twins were visiting. I see where the Texas Rangers had a Marlboro ad on the back of their 1974 program:
https://www.ebay.com/itm/1974-Texas-...kAAOSw~G9b4Kqu

That makes sense. So far it looks like at least the Rangers, Angels, and Orioles ran Marlboro ads on the backs of their 1974 scorecard programs, but none of the ones I've seen so far match the dark background color visible on the ad in the Killebrew card.