If you look closely, you will see that the screw is not centered on the washer. Yet it appears to be never been touched by a screwdriver. I believe at the least the tabs and seal have been replaced recently.
The other thing is: notice the nearly identical scratches at 4 o'clock and 10 o'clock with matching minor dents on the inner ridge of cap. Better seen on ebay site with zoom. Booth scratches are V shaped and point directly at a dent. There is damaged all around the inner circle, pretty much evenly spaced around the whole circumference. My rosemead repop also has similar "dings" around the inner ring. This was positively ID'd as a repop by DavidG in this post:
https://www.fordbarn.com/forum/showthread.php?t=202202
I believe this cap on ebay is a rosemead repop
PS NONE of my original caps show any dings like the rosemead