Panorama slide: Small ('toy') format -- 8.3cm / 3.25 inch
Sample image of this type of slide – slide shown is slide 1 of Le Petit Poucet: [8.3cm format] (story: Lapierre et Cie, at least 6 slides, n.d.)
Museum Sloten – reproduced by permission. Digital image © 2020 Museum Stedhûs Sleat - CC0 (no copyright).