Hello Ralf,
of course the forewings are recto ,while the hindwings 96% to me are verso.
Hello Wessel,
to give an exact diagnosis just post,if possible very sharp at the body section, a foto of the reverse side. As I don't have that species in my collection and as there are no pictures showing the underside in my literature and also in the web, this could be a way for correct diagnosis.
Btw, if wings have to be reinserted this can be done without traces of glue as I checked in my collection where I have few that way repaired specimens( I use glue for bookbinding).
In birdwings loose wings can easily result already after short time of overrelaxing in relaxing box as I had to face that problem occasionally in Trogonoptera and Troides but also Charaxes.
Best regards
Hans