Here's another Brooks Robinson oddball that isn't too hard to find, the 1977 Sportscaster cards
The Sportscaster cards were available through a subscription deal, a few cards mailed to you each month. The subjects included a wide variety of sports and I've even seen some non-sports cards. They are 4 1/2" x 6". The early issues appear to be easier to find, because most people tended to cancel their subscription at some point. Some of the later issues can go for big bucks to player and team collectors.
The Orioles I have include Brooks Robinson (1977), Earl Weaver (1978) and Jim Palmer, Mike Flanagan, Frank Robinson, Memorial Stadium (1979)
For those of you who enjoy variations, the Brooks Robinson has two different backs. On the last line at the bottom, one card has a capital A printed, while the other has no A. Not sure why.
Front of card
1977 Sportscasters.jpg
Back of card
SCAN7766-1.jpg
Close up of variation with A printed on the last line
SCAN7766.JPG