Here is a picture of a car that was discussed a few months back. 6K original miles. This breather looks similar.

Also of interest to me in this magazine car is the valve cover. There were discussions about the different part numbers for the AAR/TA valve cover as opposed to the standard 340. From the limited view here, this passenger side one seems to have the loom mount on the valve cover top further back as would be expected of the AAR/TA specific type.