Hi all,
As some of us have become engrossed in this thread, I was looking at the usual suspects (photos) and noticed one was different from another of which I believe no one has noticed before and have thought to be the same image. I am sure Ferko and most likely Grosz knew of this, but no one has mentioned it here.
Our old familiar images from Ferko;

This photo is at a different angle. Note the guys at the left in front of the other plane trying to squat down. Also look at the right hand wingtip and you will see it is in a different position in relation to the triplanes in the background. This image is also from Ferko (in Leaman's Triplane book).
I wonder if this was the image he could read the serial number 425/17 or more likely the tighter center image.
Now here are close-ups of the two images to see if anything at all can be seen of benefit.
As usual just when you thought you knew it all....
We need high dpi file scan copies from University of Dallas!!! Anybody out there?
Best wishes,
Dave W.