So it began me thinking .......
I know ..... YIKES!

Listening to the ISO tracks of Panama, Unchained, Hang em High, and from the first album Feel Your Love Tonight I have to say that there is not a whole hell of a lot of difference in that right speaker that chucks out pure reverb only.
I know dudes go on and on about the Sunset reverb room but I am thinkin its a plate.
Panama is from 1984 and it shares alot of reverb similarity to the first record. If you pan your stereo to only hear the right side its pretty damn congruent on all these songs. And I don't think Ed left 5150 to go add reverb to his shit down at Sunset for panama.
Anyhow-even if it was mic'd room or plate I believe the panned hard right sound is mono reverb. I used to think it was hard left was dry and some reverb center and hard right in stereo. But the more I listen and tweak in the rig on a plate setting and in straight mono the closer it seems to sound.
I know rooms could be stereo mic'd and plates were stereo as well.....
but do you think it was made and panned hard right in mono? My ears are thinking for the mixing of all things and keeping it simple thats what they did. It sure sounds ... more like it than stereo verb does. Weird but goin mono with it sounds damn good.