I've not done sufficient research to know what all of the specific AFC teams wore for the season, however, being familiar with the Broncos jerseys of this year, I may be able to shed some light on the topic in general.

The Broncos' game jerseys for the '84 season, featured a 25th anniversary patch which measured 3" in diameter. Also publicly available was a larger 4-4.5" diameter patch that was of an identical design. These larger patches, however, were never used on the game jerseys.

From previous discussions regarding the Chargers jerseys, is sounds as if the opposite might be the case--two different sizes, with the larger of the two making their way onto the teams uniforms.

On a side note, I seem to recall the Raiders having affixed the patch to the left upper outseam of the pant leg and I believe that they may have been the only one of the 8 teams to have not worn the 25th anniv. patch on their jerseys. The Raiders bucking a trend, go figure

Best regards,