Panorama slide: Small ('toy') format -- 5.5 cm
Sample image of this type of slide – slide shown is unnumbered slide from [Caricaturesque characters B] (comic: Lapierre et Cie, at least 2 slides, n.d.)
Museum Sloten – reproduced by permission. Digital image © 2020 Museum Stedhûs Sleat - CC0 (no copyright).