I'm not sure whey there would have been a prototype UO-1 since it was bought "off the shelf".
Perhaps it was the one evaluated by the USN (a sales demonstrator if you will).
Today, a manufacturer would paint it in faux military markings for the eval, back then, probably not. I base that guess on photos I've seen of other GA-types during military trials and evaluations.
Did a quick search, sorry, didn't come up with anything.
BTW: N73LW was last issued to a Twin Comamche, now exported to Canada.
There is a Piper heritage museum in Lock Haven, I understand they have a lot of factory files, they might have something.
Last edited by J Boyle; 7th December 2011 at 16:21.
There are two sides to every story. The truth is usually somewhere between the two.