I have 14 of these cards plus the Astrodome card. I'm thinking they may be a Topps product since that's basically all there was in the 60's. A's moved to Oakland in 1968. The Braves moved to Atlanta in 1966. The Angels became the California Angels in 1965. Astrodome opened 1965 and Crosley Field(Cincinnati),Connie MackStadium(Philadelphia) and Forbes Field(Pittsburgh) all closed in 1970, so I would guess they probably have to be 1968 or 1969 issues.
I have Atlanta, Baltimore, California, Cubs, White sox, Cincinnati, Detroit, Minnesota, Mets, Yankees, Oakland, Philadelphia, Pittsburgh, St. Louis and the Astrodome cards.
Anybody out there who can help id these?