Just a quick look in at lunchtime.
I agree with
Skytrain, it is very like the Jona and I wonder if, when
RR said that it wasn't the "wobbly wing" J6, he was correct in that his silhouette clearly shows struts supporting the upper wing and an absence of the "pivot pylon". Also there is no outer cowling (Townend-ring) on the engine. So could it be the "fixed wing" J6S ?
http://www.airwar.ru/image/idop/other2/j6/j6-3.jpg
I was not happy with appearance of the lower wing in the link I posted (I now think it's just unbolted), so before I go home I've had another poke around and found these drawings:
Jona J6 S – Manuale d’uso e manutenzione
Note that the Manual's Title is Jona 6-S (without the J)
Thanks for the support
LM
Open House please if correct as I'm off fairly soon.