ahh, the AR-14 plot thickens...
OK, not like I am obsessing about this or anything, but...
The ad posted by Grayhouse got me thinking. The ones in G's ad scan are earlier than 1977, as you can tell by their brass colored "AR-14" labels. You can see the 1977 and later "AR" tags in the brochure ZIPped at the Classic Speaker Pages.
As luck (?) would have it, I have ONE of the earlier AR's like the ones in G's scan: Just went downstairs, pulled it out from under the bench, and snapped a photo of ITS tweeter. This one looks much more Peerless-esque, although (interestingly) the mounting plate is rounded off (similar to the older AR-14's I showed above), not rectangular. Hmmm....
Now, in terms of the original thread: were it me, I'd certainly grab a pair of AR-14's for $25!