I apologize if these have been posted before, but a search of the thread didn't yield any results.
Shortly after the 1970 World Series, artist Carl Aldana produced a small set of cards of the Orioles. The cards are listed as 1970, but with the inclusion of two cards showing Brooks Robinson's famous catch from the World Series, the earliest printing would be late 1970. Aldana was from the west coast and produced several sets, including cards of PCL players. I'm not sure why he selected to print a set featuring the Orioles.
The set contains 12 cards and includes two of Brooks Robinson. The cards are slightly smaller than regular Topps cards, more the size of 1951/52 Bowman cards.
1970 Carl Aldana Orioles set
1970 Carl Aldana #1.jpg 1970 Carl Aldana #2.JPG