2 Mark 50 Pfennig - coupon d'intérêt

The Reichsschuldenverwaltung issued these fractional interest coupons as part of the post-inflation debt restructuring that followed the Rentenmark stabilization of late 1923. Germany's hyperinflationary collapse had rendered the old Imperial bond structure worthless; these coupons were attached to newly redenominated debt instruments and detached periodically to claim interest payments — functioning less like banknotes than like dividend warrants on restructured sovereign obligations.

The dry seal is the only anti-counterfeiting measure, which tells you something about who was expected to handle these: institutional bondholders and bank clerks, not the general public.