Good morning Mark,
I love collecting those large Oriole calendar displays. I don't have that 1984 one but I will definitely look for it now. The Tom Sellek rip-off is great.
Here is a 1981 Schlitz Calendar (the year Cal debuted):
1981 Orioles Calendar.jpg
And a 1988 Miller Lite Calendar (the year I started collecting):
1988 Orioles Calendar.jpg
And speaking of very 80's designs, here is the poster given away when Jim Palmer and Ken Singleton were inducted into the Orioles Hall of Fame in 1986:
1986 Orioles HOF Poster.jpg