Mark...
Yes, those cards were oversized (little bigger than a postcard).
There also was a one year publication in 1987 (available via subscription) which was entitled aptly enough "Baltimore Orioles Magazine" and they probably published 4-5 issues before ceasing operation.
Here is a subscription form (later signed by Jr., Sr. & Bill) which I remember picking up at the Babe Ruth Museum that Spring and the very first issue used this cover design as well:
