50 Kronor

P#53 ran for an unusually long production window — over two decades — which produced a wide range of date variants and signature combinations. The series carries at least eight distinct signature pairings across its run, a detail that matters far more to specialists than the casual collector typically expects.

Tumba Bruk, the Riksbank's own paper mill and printing works, has produced Swedish banknote paper since 1755, making it one of the oldest continuously operating security printing facilities in the world. Notes printed in-house by the issuing central bank rather than contracted to a commercial printer are not as common globally as one might assume.