Soldier Dick : "I may be mistaken because it was a long time ago, but i thought the instrument i played[ that had these] was a Lachenal Ediophone"

Just came to my mind that the fold depths vary with Edeophones as well and my impression is that older ones more often had deeper folds than later ones (?)
Might be a possibility that deeper folds was an older traditional feature that was abandoned in later productions generally. Maybe later players preferred more stable/rigid bellows, or makers had found out that the deeper folded bellows were worn out sooner (??)

Some experiences or thoughts on this?