It's been a decade since I've seen a strange rear fender like this, but dang, my memory isn't completely shot, I remembered where I saw it... and was able to find it in the archives

I found the above, and sure, the folding window frame is a unique piece...but recognized the fender

1923 McFarlan  https://justacarguy.blogspot.com/2013/09/ever-seen-picnic-awning-on-car-before.html

https://forums.aaca.org/topic/341211-period-images-to-relieve-some-of-the-stress/page/484/